Mishimoto Radiator Cap, High-Pressure 1.3 Bar with Universal Fill Necks, for Efficient Cooling, Small

The Mishimoto High Pressure Radiator Cap (1.3 bar) offers a smart upgrade for cooling many vehicles and fits standard 31–32 mm fill necks.

Designed to replace factory caps that are not built for higher pressure and extreme driving, this cap raises coolant system pressure to 1.3 bar (19 psi), increasing the boiling point of coolant for safer operation under demanding conditions.

Users consistently confirm its fit and easy installation, with no modifications required.

It’s a straightforward OEM upgrade that prevents coolant loss due to vaporization and maintains system reliability.

Built from high-strength alloy steel with an ergonomic screw-in design, this cap resists corrosion and remains sealed even after repeated removal.

The painted finish and precise threading deliver OEM-level fit and peace of mind.

In an automotive climate where engine cooling reliability is critical, especially in hotter climates, turbocharged applications, and performance builds, this cap addresses a growing trend toward upgrades with minimal effort.

As coolant systems are pushed beyond OEM limits, a high-pressure cap becomes an effective safeguard against overheating and fluid loss.

Backed by Mishimoto’s engineering-first approach and long-standing reputation in performance cooling, this cap gives owners a reliable upgrade that performs and endures.