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If your Ram 2500 Diesel is running hot, cold, or exhibiting unstable temperature swings, the thermostat is often the first component to check. The right thermostat helps the engine reach and hold optimal operating temperature, supports cabin heater performance, and reduces wear on the cooling system.This guide covers the seven top thermostats shortlisted for the Ram 2500 Diesel. We evaluate each option for fitment, opening temperature accuracy, flow capacity, and durability so you can choose a unit that matches how you drive and maintain your truck. Read on to compare the key decision points before you tackle thermostat replacement.
Looking for other parts? See all Ram 2500 parts & accessories.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | MotoRad 7426-190 Fail-Safe Thermostat, 190 °F |  |
| Best Quality Built to a higher standard if you want something more solid | Mishimoto MMTS-RAM-99L Low-Temperature Racing Thermostat for Dodge Ram 5.9L/6.7L Cummins (1999–2013) |  |
| Best Value The sweet spot between price and what you get | A-Premium Engine Coolant Thermostat with Seal for 6.7L Cummins Ram and Ford Trucks |  |
| Best Budget The cheapest option that still gets the job done reliably | MOCA Engine Coolant Thermostat Housing Assembly for Ram 2500/3500 and Selected Ford/Truck Diesel Engines |  |
| Highest Rated A top-rated pick with lots of positive feedback | Gates Engine Coolant Thermostat for Ram 2500 6.7L L6 (2013–2019) |  |
| Most Popular A crowd favorite that many people choose with confidence | MotoRad 416-180 Engine Coolant Thermostat with Seal |  |
| Best Seller A high-volume bestseller chosen again and again | Gates 33915 Engine Coolant Thermostat |  |
1. MotoRad 7426-190 Fail-Safe Thermostat, 190 °F
| Temperature | 190 °F |
|---|---|
| Included components | (1) Fail-Safe Thermostat, 190 °F |
| Material Type | Aluminum, Stainless Steel |
| Model Name | 7426-190 |
The MotoRad 7426-190 is a fail-safe engine thermostat set to open at 190 °F for heavy-duty pickup and medium-duty trucks. It replaces the factory thermostat in compatible Ram 2500/3500/4000/4500/5500 and select Ford F-650/F-750 applications and is used during routine cooling-system maintenance or when a failing thermostat causes poor warm-up or overheating. Built from aluminum and stainless steel, this unit claims OEM-quality fit and offers a locked-open fail-safe feature to prevent engine damage from overheating. Installation is straightforward for anyone comfortable with basic coolant-system work and follows the same steps as a factory replacement. The practical benefit is predictable temperature control and reduced risk of stuck-closed failures that can lead to head gasket or engine damage. Limitations are minimal but include the fixed 190 °F calibration, which may not suit users wanting a higher or lower temperature than stock, and compatibility is limited to the listed heavy-duty models so it is not a universal replacement.
Best for: Buyers who want a dependable, factory-style replacement thermostat for heavy-duty Ram diesel trucks and value a fail-safe design to protect the engine during cooling-system failures.
Less Ideal for: Not a good choice for owners running modified cooling strategies or who need a thermostat set to a nonstandard temperature for performance tuning.
- Fail-safe locked-open design reduces risk of catastrophic overheating.
- Factory-style form and materials (aluminum and stainless steel) for reliable fitment and corrosion resistance.
- Direct fit for specified Ram 2500/3500/4000/4500/5500 and select Ford F-650/F-750 trucks, simplifying replacement.
- 190 °F calibration matches common factory operating temperature for diesel applications.
- Fixed opening temperature of 190 °F cannot be adjusted for tuned or modified engines.
Verdict: A straightforward, heavy-duty fail-safe replacement thermostat that restores factory temperature control and protects Ram diesel engines from overheating.
2. Mishimoto MMTS-RAM-99L Low-Temperature Racing Thermostat for Dodge Ram 5.9L/6.7L Cummins (1999–2013)
| Vehicle fitment | Dodge Ram 1999–2013 5.9L/6.7L Cummins |
|---|---|
| Activation temperature | 180°F (82°C) |
| Mounting type | Direct fit |
| Manufacturer warranty | Limited lifetime. |
The Mishimoto MMTS-RAM-99L is a direct-replacement low-temperature thermostat aimed at improving cooling for 5.9L and 6.7L Cummins-powered Dodge Rams from 1999 through 2013. It opens at 180°F versus the factory unit, so coolant begins circulating sooner and engine temperatures run lower during heavy towing, high ambient heat, or modified turbo setups. Installation is straightforward because it is built as a direct fit and ships with the gasket where applicable. For performance drivers this means reduced risk of heat soak, more consistent operating temps under load, and potentially better charge-air cooling when paired with intercooler or turbo upgrades. The main compromise is that a lower activation temperature can delay reaching full operating temperature in cooler climates, which may affect warm-up behavior and emissions until the engine reaches optimal range. Overall this thermostat suits enthusiasts who push their Rams hard and need improved thermal control in warm or demanding conditions.
Best for: Drivers who push their Ram with heavy towing, performance upgrades, or regular high-load use and want a simple, reliable way to reduce operating coolant temperatures.
Less Ideal for: Drivers who primarily operate in cold climates or who prioritize fastest possible engine warm-up and stock emissions behavior over lower peak temperatures.
- Direct-fit design for 1999–2013 Dodge Ram 2500/3500 with 5.9L or 6.7L Cummins for simple installation
- Lower activation temperature (180°F) reduces peak engine coolant temps under heavy load
- Includes rubber gasket when applicable and is offered with a lifetime warranty from the manufacturer
- Designed for improved cooling reliability during towing, high ambient temps, and modified turbo applications
- Lower activation temperature can slow engine warm-up and may be less suitable for cold-climate daily driving
Verdict: If you need a straightforward upgrade to lower peak coolant temperatures during heavy towing or tuned turbo use on a 1999–2013 Ram diesel, this Mishimoto low-temp thermostat is the practical choice.
3. A-Premium Engine Coolant Thermostat with Seal for 6.7L Cummins Ram and Ford Trucks
| Start to Open Temperature | 88°C |
|---|---|
| Gasket or Seal Included | Yes |
| Material | Metal and Rubber |
| Package Quantity | 1 |
This A-Premium thermostat replaces the factory part on many 6.7L diesel Ram and Ford trucks and is used to control coolant flow as the engine warms up. It comes with a seal and is made from metal and rubber components with a start-to-open temperature of 88°C, so it should open at the same point as the original design. Typical installation is a direct swap into the thermostat housing during routine cooling system maintenance or when diagnosing overheating or cold-running issues. The included seal reduces the chance of leaks if installed correctly, and the metal construction suggests reasonable durability for highway and towing use. Limitations are that fitment is specific to listed model years and engine configurations, so confirm compatibility before buying, and aftermarket manufacturing quality can vary compared with factory parts. A-Premium backs the unit with a one-year unlimited-mileage guarantee which provides extra confidence for daily drivers and fleet vehicles.
Best for: Buyers who prioritize a practical, cost-effective factory-style replacement for routine cooling system service on 6.7L diesel trucks and want straightforward, maintainable parts.
Less Ideal for: Avoid this if you need a performance or modified-temperature thermostat for custom tuning or race use; also skip if your vehicle is outside the listed fitment years and engines.
- Direct-replacement fit for many 6.7L Ram and Ford diesel applications
- Includes gasket/seal to help prevent installation leaks
- Starts to open at 88°C matching common factory thermostat calibration
- Metal construction for durability in high-temperature environments
- Aftermarket part so material and machining tolerances may differ from factory units
Verdict: A practical, factory-style replacement thermostat with seal and standard 88°C opening temperature for 6.7L Ram and Ford diesel trucks.
4. MOCA Engine Coolant Thermostat Housing Assembly for Ram 2500/3500 and Selected Ford/Truck Diesel Engines
| Opening temperature | 88℃ / 190℉ |
|---|---|
| Package includes | 1 Thermostat Housing Assembly |
| Manufacturer | OELINE Auto Parts |
| Manufacturer part number | MOCATH2281 |
This MOCA thermostat housing assembly replaces the factory thermostat on a range of 5.9L and 6.7L diesel Ram trucks and several Ford medium-duty models. It includes the thermostat preinstalled in the housing so installation is straightforward for a mechanically confident DIYer or a technician servicing coolant systems. The unit lists a 190°F (88°C) opening temperature and uses MOCA’s updated design intended to regulate inlet temperature and help the engine reach and hold normal operating temperature. Practical benefits include simple bolt-on fitment where it matches the listed applications and a compact assembly that reduces parts handling during replacement. Limitations are typical for aftermarket housings: fit and finish can vary from factory parts and long-term durability is less proven compared with higher-end name-brand replacements, and this part is specific to the listed heavy-duty diesel engines so it is not a universal swap. Expect to follow torque specs and use new gaskets when installing to avoid leaks.
Best for: DIY truck owners or independent shops seeking an affordable, ready-to-install replacement for specified Ram 2500/3500 diesel engines who prioritize lower upfront cost and straightforward installation.
Less Ideal for: Owners seeking a long-proven factory-quality or premium OEM replacement or those who need a thermostat for vehicles outside the listed diesel applications should look elsewhere.
- Preassembled thermostat and housing for faster replacement
- Designed for heavy-duty 5.9L and 6.7L diesel Ram engines and specific Ford medium-duty models
- Rated opening temperature of 190°F for standard engine warm-up behavior
- Compact assembly reduces installation steps compared with separate thermostat and housing
- Aftermarket fit and long-term durability may vary compared with factory-quality parts
Verdict: A budget-friendly, preassembled thermostat housing built to replace the factory unit on listed 5.9L and 6.7L diesel Rams for quick, low-cost repairs.
5. Gates Engine Coolant Thermostat for Ram 2500 6.7L L6 (2013–2019)
| Compatible vehicles | Ram 2500 2013-2019 6.7L L6 |
|---|---|
| Manufacturer | Sixity Auto |
| Manufacturer Part Number | 4036024480 |
| Includes | Seal and hardware |
This Gates engine coolant thermostat is a factory-quality direct replacement for the 6.7L inline-six in Ram 2500 trucks from 2013 through 2019. Installed in the cooling circuit, it opens and closes at the designed temperature to maintain stable operating temperature and prevent overheating or overcooling. The unit ships with the seal and original-style hardware, which simplifies installation and reduces the chance of leaks when swapped into the factory housing. Buyers will appreciate the straightforward fitment for the specified model years and the use of proven Gates components that mirror factory operation. One limitation is that it is built for a specific temperature calibration and vehicle application, so fitment confirmation is necessary before purchase; there is no universal fitment or multi-vehicle coverage beyond the listed Ram 2500 years. For owners prioritizing dependable temperature control and straightforward replacement, this thermostat gives a close-to-factory performance without extra complexity.
Best for: Owners of Ram 2500 diesel trucks who want a reliable, factory-equivalent temperature control part that installs cleanly and restores proper cooling system behavior.
Less Ideal for: People who need a thermostat for other vehicles, different engines, or who want adjustable or performance-tuned temperature controls.
- Factory-style design that replicates original temperature regulation
- Includes seal and hardware to simplify installation and minimize leaks
- Direct replacement fit for Ram 2500 6.7L L6 (2013–2019) reducing installation uncertainty
- Fitment is limited to the listed Ram 2500 6.7L years and not suitable as a universal or multi-vehicle thermostat
Verdict: Choose this factory-style replacement if you want a dependable, plug-in thermostat that restores correct temperature control on a 2013–2019 Ram 2500 6.7L diesel.
6. MotoRad 416-180 Engine Coolant Thermostat with Seal
| Manufacturer | Motorad |
|---|---|
| Model | 416-180 |
| Position | Center |
The MotoRad 416-180 is a direct-replacement coolant thermostat designed to restore proper engine temperature control on compatible Ram and related vehicles. It installs in the center position and comes machined with a preinstalled seal to simplify fitment and reduce leak risk during installation. In daily use it regulates coolant flow to help the engine reach and hold optimal operating temperature, which aids warm-up, heater performance, and fuel efficiency. The unit is a straightforward mechanical thermostat with no electronic controls, so it is reliable and easy for a mechanic or competent DIYer to swap in during routine cooling system service. Limitations are its vehicle-specific fitment and absence of vehicle-specific calibration beyond the stamped thermostat spec, so verify compatibility for Ram 2500 diesel applications before buying. The part offers a low-complexity solution for replacing a failed thermostat without modifying the cooling system.
Best for: Buyers who prioritize proven, no-frills replacement parts backed by many user purchases and prefer a part that is easy for a mechanic to install and validate.
Less Ideal for: Drivers who need an electronically controlled or vehicle-programmed thermostat for modified engines or advanced temperature management.
- Preinstalled seal reduces chance of installation leaks
- Machined exterior finish for consistent fit and operation
- Simple mechanical design that is easy to install or replace
- Covers many model years commonly found on Ram and related vehicles
- Fitment is vehicle-specific so it requires verification for Ram 2500 diesel applications
- No electronic temperature staging or advanced calibration features
Verdict: A straightforward, widely used mechanical replacement thermostat that gives a low-risk way to restore proper cooling function on compatible Ram 2500 vehicles.
7. Gates 33915 Engine Coolant Thermostat
| Brand | Gates |
|---|---|
| Included Components | Engine Coolant Thermostat |
| Material | Metal |
| Manufacturer Part Number | 33915 |
| OEM Part Number | 5011456AA, 5086739AB, 5292712, 68005464AA, 68005464AB |
The Gates 33915 is a metal engine coolant thermostat built for accurate temperature regulation in cooling systems. It uses a positive piston heat motor and factory calibration to open and close consistently even with pressure changes, which helps the engine reach and hold proper operating temperature. Typical use is as a direct replacement in compatible diesel truck cooling circuits where stable thermostat action prevents overcooling or overheating. The sturdy machined metal construction and listed OEM part numbers indicate it is intended as a reliable factory-quality replacement. Because the unit is a mechanical thermostat, installation is straightforward for anyone familiar with cooling system work, but it does not include a gasket or additional hardware so expect to source those separately. The product focuses on dependable, predictable function rather than auxiliary features, making it a conservative choice for owners who prioritize long-term stability over aftermarket gimmicks.
Best for: Buyers who want a conservative, factory-quality replacement thermostat that prioritizes reliable temperature control and long-term consistency over added features.
Less Ideal for: Buyers looking for thermostats with electronic control, adjustable temperature settings, or plug-and-play kits that include all installation hardware.
- Factory-controlled calibration for consistent open/close temperatures
- Positive piston heat motor for reliable thermostatic action under pressure variations
- Sturdy machined metal construction for durability
- Matches multiple manufacturer part numbers for direct replacement fitment
- Does not include gasket or installation hardware
Verdict: Choose this Gates thermostat when you need a factory-calibrated, metal direct-replacement that emphasizes dependable, predictable temperature control.
Choosing the Right Ram 2500 Diesel Thermostat: Key Factors to Consider
Opening Temperature and Thermal Accuracy
The thermostat's opening temperature directly controls when coolant begins circulating through the radiator, so it affects warm-up time, emissions, and engine efficiency. For a diesel Ram 2500, a thermostat that opens too early can keep the engine running cool, reducing fuel efficiency and causing oil to thicken. Conversely, a unit that opens too late or hangs can lead to overheating under load.
Look for thermostats specified close to the manufacturer-recommended temperature with tight tolerances. Small differences in actuation temperature can change cabin heater output and turbocharger operating conditions. Consistent opening and closing behavior across repeated cycles is more important than slight nominal differences on paper.
Physical Fitment and Seal Integrity
Correct physical fitment prevents leaks and ensures reliable operation. Thermostat housings and gasket faces must match the Ram 2500 Diesel's mounting points and coolant passages. Even minor mismatches can cause coolant bypass, thermostat misalignment, or gasket deformation leading to a thermostat housing seal leak.
Choose units with the proper outer diameter, flange pattern, and a compatible gasket or O-ring design. Pay attention to whether the replacement includes the gasket, sealant beads, or a housing O-ring because missing sealing components often lead to repeat leaks after installation.
Flow Capacity and Bypass Characteristics
Flow capacity determines how quickly coolant moves once the thermostat opens and how much bypass flow exists when it is closed. Some thermostats have engineered bypass passages that maintain a controlled flow to avoid thermal shock and ensure heater core circulation. On a Ram 2500 Diesel, adequate flow is essential under towing, hauling, or extended idling conditions.
A thermostat that restricts flow can increase head temperature and stress on the cooling system. Look for performance data or design notes describing valve size and bypass routing to ensure the unit will handle the engine's cooling demands.
Material Durability and Corrosion Resistance
Materials affect how long the thermostat and its housing survive in the cooling environment. Brass, stainless steel, and high-grade polymers resist corrosion and scale better than low-quality alloys. Corrosion can cause the valve to stick or the housing face to deteriorate, which leads to leaks and improper operation.
For diesel applications, where coolant additives and combustion byproducts can be more aggressive, select thermostats and gaskets designed for long-term resistance to electrochemical corrosion and deposits. Durable materials reduce the chance of premature failure and lower the frequency of future engine thermostat replacement.
Ease of Installation and Serviceability
Thermostat replacement for the Ram 2500 Diesel can range from straightforward to moderately involved depending on the housing location and accessory clearance. A unit designed for easy alignment, with clear gasket orientation and included seals, reduces installation time and the risk of incorrect assembly.
Consider whether the replacement requires special tools or removal of major components. Thermostat housings that are integrated with multiple sensors or passages may need careful handling. Favor options that come with clear fitment guidance and standard fastener patterns to simplify future servicing.
Compatibility With Coolant Type and System Pressures
Different coolant chemistries and system pressure ratings affect part selection. The thermostat and its housing must tolerate the Ram 2500 Diesel's coolant type and the pressure cap setting on the radiator or expansion tank. Some gaskets and O-rings degrade faster with certain formulas, increasing the chance of a thermostat housing seal leak.
Verify the replacement's compatibility with the coolant you use and confirm it can handle the system's normal operating pressure. This ensures a reliable seal and prevents performance issues related to material incompatibility.
Common Thermostat Symptoms and Diagnosis
Recognizing thermostat symptoms overheating or running too cold helps you decide whether replacement is necessary. Typical signs include rapid temperature rise on the gauge, fluctuating engine temperature at idle, and lack of consistent cabin heat when the engine is warm.
On the other hand, an engine running cold thermostat stuck open often results in long warm-up times, poor fuel economy, and weak heater output. A visible coolant leak near the thermostat housing can indicate a thermostat housing seal leak.
- High, steady temperature while idling or under load suggests the thermostat may be stuck closed.
- Very slow warm-up and low operating temperature usually indicate a thermostat stuck open.
- Coolant puddles or seepage at the housing flange point to a sealing issue rather than thermal failure.
How to Test a Thermostat on a Ram 2500 Diesel
There are practical checks you can perform before removing the unit. Start with a cold engine and monitor the temperature rise while idling until the thermostat should open. If the upper radiator hose stays cool well past the expected warm-up period, the thermostat may be stuck closed.
A further test involves feeling the upper radiator hose and lower hose after the engine is up to temperature. Both hoses should begin to warm as the thermostat opens. If you need to remove the thermostat, you can perform a boiling-point test in hot water to observe valve movement, but follow safety precautions and consult factory guidance for correct opening temperature ranges.
- Always let the engine cool before opening the cooling system to avoid burns.
- Use a reliable infrared thermometer or coolant temperature gauge for more accurate diagnosis.
- Document hose temperatures and the time it takes to reach operating temperature for clearer assessment.
Thermostat Installation Tips and Best Practices
When replacing the thermostat, prepare the area by draining coolant to a safe level and removing any obstructing components. Clean mating surfaces thoroughly and inspect the housing face for warpage or damage that can prevent a proper seal. Use only the recommended gasket style and torque fasteners to the factory specification to avoid distortion.
After installation, refill the cooling system and follow proper bleed procedures to eliminate air pockets. Run the engine and monitor temperature response and the housing area for leaks. Recheck coolant level after a short test drive to confirm there are no seal issues.
- Replace O-rings and gaskets with new parts supplied with the thermostat or the correct OEM-equivalent items.
- Tighten bolts in a cross pattern and to specified torque values to avoid uneven sealing.
- Bleed air thoroughly; trapped air can mimic thermostat problems by causing false hot spots.
When To Replace the Thermostat and Related Components
Consider replacing the thermostat whenever you open its housing for other repairs, such as water pump service or a thermostat housing seal leak. Preventive replacement can be a cost-effective step when coolant-age indicators suggest the system is due for maintenance.
Also inspect the housing, nearby hoses, and related sensors during service. A failing thermostat sometimes coincides with deteriorated hoses or a weak coolant pump, and addressing these together prevents repeat labor and reduces the chance of future overheating or cold-running problems.
- Replace the thermostat if it does not open at the expected temperature in bench tests.
- Address visible corrosion, pitting, or distortion on the housing when replacing the thermostat.
- Consider scheduled replacement if the vehicle has high mileage and the cooling system has not been refreshed recently.
Understanding Fitment and Thermostat Part Number Fitment
Thermostat part number fitment is critical for the Ram 2500 Diesel because subtle differences in flange size, depth, and bypass passages affect performance. Use the vehicle's model and Diesel configuration to verify the correct part family rather than relying on generic descriptors.
Cross-reference the part number with physical dimensions and documented opening temperature. When in doubt, compare gasket shape, mounting hole spacing, and valve diameter to the removed unit to confirm compatibility before installation.
- Keep the old thermostat handy during parts lookup to match dimensions if needed.
- Note down the opening temperature stamped or printed on the part when present.
- Confirm whether the replacement comes with the housing gasket or requires a separate purchase.
Still looking for the perfect fit?
Select your Ram 2500 configuration to see the most relevant Thermostats recommendations
How We Chose the Best Ram 2500 Diesel Thermostat
We applied a practical, vehicle-focused filter to identify thermostats best suited to the Ram 2500 Diesel. Selection began with units that match the engine family's specified opening temperature and physical fitment for the Diesel configuration. We prioritized thermostats with documented flow capacity and robust valve mechanisms that resist sticking under long idling or heavy-load conditions.Corrosion resistance, materials used for the gasket and housing interface, and compatibility with the cooling system's pressure and coolant type were considered next. We also looked for units with straightforward installation requirements and common mounting patterns to minimize the risk of misfitment during engine thermostat replacement. Durability indicators included resistance to scale and deposits plus warranty coverage where applicable.Excluded items were universal or generic thermostats that required significant modification, parts intended only for gasoline engines, and units without clear specification sheets. Final choices balanced real-world fitment, thermal performance, and reliability for Ram 2500 Diesel owners.
Our full evaluation process is outlined in our review methodology.
FAQ
What are the first signs of a bad thermostat in a Ram 2500 Diesel?
Common early signs include slow warm-up, fluctuating temperature gauge readings, reduced heater output, and visible coolant seepage at the thermostat housing. These symptoms often appear under idle or during repeated stop-and-go operation.
Can I test the thermostat without removing it from the truck?
Yes. You can observe hose temperature changes as the engine warms and use a temperature gauge to see when coolant begins flowing to the radiator. These checks give a good indication, though bench testing the removed thermostat provides the most definitive confirmation.
How long does a thermostat typically last on a Ram 2500 Diesel?
Thermostat lifespan varies with coolant quality and operating conditions. Often they last many years, but exposure to corrosion, deposits, or repeated thermal cycling can shorten service life. Inspect it during related cooling-system repairs for preventive replacement if signs of wear are present.
Will replacing the thermostat fix overheating issues?
Sometimes. If the thermostat is stuck closed or not opening at the specified temperature, replacement can resolve overheating. However, overheating can also stem from restricted coolant flow, radiator problems, water pump issues, or air trapped in the system, so a full diagnosis is important.
Do I need to replace the gasket or housing when replacing the thermostat?
You should replace the gasket or O-ring whenever the thermostat housing is opened. Reusing old seals raises the risk of a thermostat housing seal leak. In many cases, replacement kits include the correct gasket for a reliable install.
How do I know the correct thermostat opening temperature for my Diesel Ram 2500?
Refer to the vehicle's service specifications or the stamp on the original thermostat when available. If that information is not accessible, match the replacement to the documented operating temperature range recommended for your specific Diesel configuration to maintain normal warm-up and cooling behavior.
Final Verdict
Prioritize a thermostat that matches the Ram 2500 Diesel's specified opening temperature and fits the housing without modification. Balance thermal accuracy, material durability, and flow capacity against installation ease to reduce the chance of leaks and future failures.If you suspect thermostat-related symptoms, verify hose and temperature behavior before replacing the unit, and replace associated seals during service. Choosing a properly specified thermostat and following correct installation and bleeding procedures will restore consistent engine temperature control and protect the cooling system over the long term.
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