Radiator Caps

16 products

16 products
HKS Limited Edition Radiator Cap - Hyundai Genesis Coupe
HKS Limited Edition Radiator Cap - Hyundai Genesis Coupe
HKS
CSF Radiator Mini Cap 20 PSI - Case of 20
CSF Radiator Mini Cap 20 PSI - 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 High-Pressure Radiator Cap 1.3 Bar - Small
Mishimoto High-Pressure Radiator Cap 1.3 Bar - Small
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 Type-A 1.3 Bar - Black
Radium Engineering Radiator Cap Type-A 1.3 Bar - Black
Radium Engineering
ON SALE
Radium Engineering Radiator Cap Type-A 1.1 Bar - Black
Radium Engineering Radiator Cap Type-A 1.1 Bar - Black
Radium Engineering
HKS Radiator Cap - S-Type
HKS Radiator Cap - S-Type
HKS
ON SALE
Skunk2 Radiator Cap Type-A - Honda Mazda Mitsubishi Subaru
Skunk2 Radiator Cap Type-A - Honda Mazda Mitsubishi Subaru
Skunk2 Racing
ON SALE
Skunk2 Radiator Cap Type-B - Honda Acura Scion Toyota
Skunk2 Radiator Cap Type-B - Honda Acura Scion Toyota
Skunk2 Racing
ON SALE
Mishimoto High-Pressure Radiator Cap 2.0 Bar - Small Import
Mishimoto High-Pressure Radiator Cap 2.0 Bar - Small Import
Mishimoto
ON SALE
Mishimoto Radiator Cap 1.3 Bar - Large Domestic
Mishimoto Radiator Cap 1.3 Bar - Large Domestic
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 Import
Mishimoto High-Pressure Radiator Cap 1.3 Bar - Small Import
Mishimoto
ON SALE
Mishimoto Overflow Reservoir Cap 1.1 Bar - Ford F-250 F-350
Mishimoto Overflow Reservoir Cap 1.1 Bar - Ford F-250 F-350
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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