Cusco Radiator caps enable a higher boiling point for the vehicle cooling system which ensures better protection against overheating. It also promotes efficient coolant flow through its entire system. Rated at (1.3kg/cm2). Two types of radiator caps are available, made to fit and replace OEM units.

Utilizing a reinforced main pressure valve spring and silicon seals, the internal pressure of the radiator is increased, resulting in a higher boiling point.

When coolant boils, small air pockets are created. As the coolant passes through the block and radiator core, the air pockets reduce the cooling efficiency and will eventually cause the engine to overheat.

Cusco's high-pressure radiator cap operates at 1.3kb/cm2 at zero atmospheric pressure. In theory, the atmospheric pressure of the road surface (approximately 1.0kg/cm2) is added and the pressure is 2.3kg/cm2.

Note: Operates from 2.3kg/cm2 Boiling point approximately 126.5 Degrees Celsius

This cap will not fit the BRZ/FR-S twins.

Application:
2002-2007 WRX
2004-2007 STI
2008-2014 WRX
2008-2014 STI
2015-2020 WRX
2015-2020 STI