Radiator Caps

17 products

17 products
HKS 10 Hyundai Genesis Coupe Limited Edition Radiator Cap
HKS 10 Hyundai Genesis Coupe Limited Edition Radiator Cap
HKS
CSF Radiator Cap - Mini Cap 20 psi/ Stant 10361 - Case of 20
CSF Radiator Cap - Mini Cap 20 psi/ Stant 10361 - Case of 20
CSF
ON SALE
Mishimoto Radiator Fitting 1.5in Universal Race Ready
Mishimoto Radiator Fitting 1.5in Universal Race Ready
Mishimoto
ON SALE
Mishimoto Radiator Fitting 1.25in Race Ready Adapter
Mishimoto Radiator Fitting 1.25in Race Ready Adapter
Mishimoto
ON SALE
Mishimoto High Pressure 1.3 Bar Radiator Cap Small Non Directional
Mishimoto High Pressure 1.3 Bar Radiator Cap Small Non Directional
Mishimoto
HKS RADIATOR CAP N-type
HKS RADIATOR CAP N-type
HKS
ON SALE
Radium Engineering Radiator Cap Type-A 1.5 Bar - Black
Radium Engineering Radiator Cap Type-A 1.5 Bar - Black
Radium Engineering
ON SALE
Radium Engineering Radiator Cap, Typ-A 1.3Bar - Black
Radium Engineering Radiator Cap, Typ-A 1.3Bar - Black
Radium Engineering
ON SALE
Radium Engineering Radiator Cap Type-A 1.1Bar Black
Radium Engineering Radiator Cap Type-A 1.1Bar Black
Radium Engineering
HKS RADIATOR CAP S-Type
HKS RADIATOR CAP S-Type
HKS
ON SALE
Skunk2 Honda Acura/Mazda/Mitsubishi/Subaru Radiator Cap
Skunk2 Honda Acura/Mazda/Mitsubishi/Subaru Radiator Cap
Skunk2 Racing
ON SALE
Skunk2 Honda/Acura/Scion Radiator Cap
Skunk2 Honda/Acura/Scion Radiator Cap
Skunk2 Racing
ON SALE
Mishimoto High Pressure Radiator Cap - 2.0 Bar Small
Mishimoto High Pressure Radiator Cap - 2.0 Bar Small
Mishimoto
ON SALE
Mishimoto Radiator Cap 1.3 Bar Large for Domestic Vehicles
Mishimoto Radiator Cap 1.3 Bar Large for Domestic Vehicles
Mishimoto
ON SALE
Mishimoto Carbon Fiber Radiator Cap 1.3 Bar Small Import
Mishimoto Carbon Fiber Radiator Cap 1.3 Bar Small Import
Mishimoto
ON SALE
Mishimoto High Pressure Radiator Cap 1.3 Bar Small
Mishimoto High Pressure Radiator Cap 1.3 Bar Small
Mishimoto
ON SALE
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 99-15 Ford F-250/F-350/F-450/F-550 Super Duty Overflow Reservoir Cap
Mishimoto

Radiator Caps & High-Pressure Radiator Caps

The radiator cap maintains system pressure in the cooling system, raising the boiling point of the coolant and preventing overheating under load. A worn or incorrect-pressure cap allows coolant to boil prematurely, causing overheating, coolant loss, and potential engine damage. High-pressure radiator caps increase cooling system pressure for additional boiling point margin on performance and track vehicles.

OneFastShop carries radiator caps including OE-replacement radiator caps, high-pressure performance caps, lever-release racing caps, and direct-fit caps in the correct pressure ratings for popular engine platforms.

Every radiator cap at OneFastShop ships brand-new with manufacturer warranty coverage. Whether you're replacing a worn cap, upgrading to a higher-pressure racing cap, or matching the correct pressure rating for your cooling system, OneFastShop has the cap. Shop the full radiator caps collection today.
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