Mishimoto 1.1 Bar Rated 99-15 Ford F-250/F-350/F-450/F-550 Super Duty Overflow Reservoir Cap

Mishimoto 1.1 Bar Rated Overflow Reservoir Cap

Fits 1999–2015 Ford F-250, F-350, F-450, F-550 Super Duty and More

When you’re pushing your vehicle in tough conditions—whether towing, racing, or daily driving—the smallest details make a difference. In these situations, your cooling system is under constant pressure. Unfortunately, factory radiator caps are often the weakest link. In fact, they tend to wear out quickly and may fail to maintain pressure, especially over time.

That’s where the Mishimoto Ford Super Duty Overflow Cap steps in. Specifically designed for Ford Super Duty trucks (1999–2015) and a wide range of other Ford models, this upgraded cap maintains proper cooling pressure even under demanding conditions. As a result, your coolant stays inside the system—right where it belongs.

Key Features & Benefits of Mishimoto Ford Super Duty Overflow Cap

• Rated at 1.1 Bar (16 psi)
  It helps raise the boiling point of your coolant, thereby increasing system efficiency and reducing the risk of overheating.
• Direct-Fit Replacement
  This cap installs easily in place of the factory cap. No tools or modifications are needed, so installation is fast and convenient.
• Durable Construction
  It is built to handle the stress of performance applications and high-temperature driving.
• Prevents Coolant Loss
  In doing so, it keeps your system sealed and coolant circulating as intended.
• Mishimoto Quality
  Moreover, it is backed by Mishimoto’s reputation for engineering reliable, race-tested cooling components.

Vehicle Compatibility

This cap is compatible with hundreds of Ford vehicles, including:

• 1999–2015 Ford Super Duty (F-250, F-350, F-450, F-550)
• Ford Mustang, Ranger, Taurus, Fusion, Explorer, Edge, Expedition, and more
• Crown Victoria, E-Series Vans, Flex, Excursion, and Lincoln models

For best results, full compatibility details are listed above to ensure exact fit.

Ideal For:

• Upgraded or performance cooling systems
• Vehicles experiencing pressure loss from stock caps
• Long-haul towing and diesel work trucks
• Race applications or hard street driving
• Preventive cooling system maintenance

Why Choose the Mishimoto Ford Super Duty Overflow Cap?

Because performance starts with consistency. A failing radiator cap can quietly ruin your system over time—lowering your coolant’s boiling point and letting pressure escape. Therefore, the Mishimoto 1.1 Bar Radiator Cap is a simple but essential upgrade. It helps protect your engine, reduces the risk of overheating, and provides peace of mind every time you drive.

If you're running a 6.7L Power Stroke, modular V8, EcoBoost, or even a daily-driven sedan, this cap is an affordable and effective way to reinforce your cooling system.