KOYORAD Universal Radiator Cap

1.3 kgf/cm² High-Pressure Rating – Built for Serious Off-Road Cooling

When you’re tackling steep climbs, hauling heavy loads, or pushing your 4x4 through punishing terrain, your cooling system needs every advantage it can get. The Koyorad High Performance Radiator Cap is engineered for enthusiasts who demand maximum cooling efficiency and unwavering reliability from their rigs.

Made in Japan with premium components, this 1.3 bar cap is the perfect upgrade for all Koyorad All-Aluminum Racing Radiators. It increases system pressure, raises coolant boiling temperature, and helps your engine shed heat faster—exactly what you need when the trail gets tough.

Why 4x4 Drivers Choose the High Performance Cap

By boosting coolant pressure to 1.3 kgf/cm², this cap elevates the boiling point of your coolant, giving your engine greater thermal stability under intense off-road conditions. The result?

  • Improved cooling efficiency under heavy load
  • Reduced risk of overheating on slow technical climbs
  • Greater performance consistency in harsh environments
  • Optimised heat transfer for modified or hard-driven engines

Whether you’re overlanding, rock crawling, towing, or touring long distances, this cap keeps your engine running cooler and stronger.

Strength Meets Style

The blue finish doesn’t just look good—it represents the toughness beneath your bonnet. Built to withstand a true open-valve pressure rating of 1.3 kgf/cm², this cap delivers dependable sealing, long-term durability, and a premium aesthetic in your engine bay.

Can Your Rig Handle the Pressure?

Equip your 4x4 with a radiator cap designed for demanding conditions and performance-built cooling systems.

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