Availability
Radiator Caps
The radiator cap is a small but important component of your vehicle’s cooling system. When functioning properly, the cap keeps contaminates and excess air out of your...
The radiator cap is a small but important component of your vehicle’s cooling system. When functioning properly, the cap keeps contaminates and excess air out of your cooling system. Excess air in the system reduces cooling efficiency and can lead to problems like engine overheating.
Most radiator caps for modern applications are designed to let a specified amount of pressure build in the system as the coolant heats up and expands. If the system’s pressure exceeds the specified radiator cap pressure, a valve in the cap opens to let coolant flow into the coolant reservoir. As the coolant temperature decreases and the system...
The radiator cap is a small but important component of your vehicle’s cooling system. When functioning properly, the cap keeps contaminates and excess air out of your cooling system. Excess air in the system reduces cooling efficiency and can lead to problems like engine overheating.
Most radiator caps for modern applications are designed to let a specified amount of pressure build in the system as the coolant heats up and expands. If the system’s pressure exceeds the specified radiator cap pressure, a valve in the cap opens to let coolant flow into the coolant reservoir. As the coolant temperature decreases and the system pressure drops, the cap allows the coolant to return to the main cooling system. For added safety, some caps come equipped with pressure-release levers to vent excess pressure before the cap is removed.
If you’re experiencing cooling problems, you may want to start with a new radiator cap. We have you covered with a wide selection of stock replacement radiator caps for just about anything you drive. We also carry radiator caps with built-in temperature gauges so you know just what’s happening inside your cooling system. When it’s time to upgrade to an aftermarket aluminum radiator, top it off with a billet aluminum radiator cap in a variety of eye-catching finishes such as natural, chrome, polished, and anodized colors to complement your engine bay.
You can shop radiator caps with pressure ratings from 0 to 42 psi in a variety of styles from trusted brands like Stant, Moroso, Be Cool, Meziere, and more. And remember, everything we sell is backed by the best customer service in the industry.
Showing In Stock Items. Show All 198 Items.
Radiator Cap, High-Pressure, 19 psi, Round, Plastic, Black, Mishimoto Logo, Fits 31-32mm Filler Necks, Each
Part Number: MIO-MMRC-13-SM
Estimated Ship Date: Today
Estimated Ship Date: Today
BUILD IT WITH SUMMIT!
Radiator Cap, Steel, Natural, 16 psi, Release Lever, Vent, Each
Part Number: SUM-380170
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Stant, 21-25 psi, With Pressure Release Lever, Each
Part Number: AAF-ALL30131
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, High-Pressure, 19 psi, Round, Steel, Black, Mishimoto Logo, Fits 42mm Filler Necks, Each
Part Number: MIO-MMRC-13L
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Stant, 16 psi, Universal, Each
Part Number: AAF-ALL30133
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, High-Pressure, 28 psi, Hexagon, Aluminum, Black, Mishimoto Logo, Fits 31-32mm Filler Necks, Each
Part Number: MIO-MMRC-20-SM
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Stant, 19-21 psi, With Pressure Release Lever, Each
Part Number: AAF-ALL30130
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Recovery High-Pressure, 32 psi, Round, Steel, Natural, 1.625 in. Diameter, Stant Racing Logo, Each
Part Number: AAF-ALL30126
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Octagon, Billet Aluminum, Natural, 16 psi, Each
Part Number: AAF-ALL30139
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, High-Pressure, Round, 22 to 24 psi, Billet Aluminum, Polished, Each
Part Number: CIR-50-10002
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Caps, Recovery High-Pressure Radiator Caps, 19-21 psi Maximum Pressure, Round, Steel, Natural, Each
Part Number: AAF-ALL30125
Estimated Ship Date: Today
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, High-Pressure, Round, 30 psi, Small-style Cap, Steel, Natural, C&R Racing Logo, Each
Part Number: CIR-50-00005
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, High-Pressure, Round, 19 psi, Small-style Cap, Steel, Natural, C&R Racing Logo, Each
Part Number: CIR-50-00004
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Pressure Tester Adapter, Set of 20
Part Number: CSF-4509
Not Yet Reviewed
Estimated Ship Date: Mar 25, 2026 if ordered today
Estimated Ship Date: Mar 25, 2026 if ordered today
Estimated Ship Date: Today
Radiator Cap, High-Pressure, Round, 31 psi, Large-style Cap, Steel, Natural, C&R Racing Logo, Each
Part Number: CIR-50-00003
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Round, 22-24 psi, Each
Part Number: AAF-ALL30136
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, High-Pressure, Round, 22 psi, Large-style Cap, Steel, Natural, C&R Racing Logo, Each
Part Number: CIR-50-00002
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Notch Grip, Round, 16 psi Maximum Pressure, Aluminum, Black Anodized, Each
Part Number: BSP-BLK75125
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Notch Grip, Round, 16 psi Maximum Pressure, Aluminum, Polished, Each
Part Number: BSP-75125
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Round, 22 psi Maximum Pressure, Stainless, Black, for 32mm I.D. Radiator Necks, for use on Honda®, for Nissan, Subaru, Toyota, Each
Part Number: RDM-18-0076-A15
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Stant Racing Division, 28-32 lbs Pressure, Octagonal, Universal, Each
Part Number: SNN-T210
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Stant Racing Division, 21-25 lbs Pressure, Octagonal, Universal, Each
Part Number: SNN-T209
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Round, 16 psi Maximum Pressure, Stainless Steel, Black, Radium Engineering Logo, for 32mm I.D. Radiator Necks, for Nissan, Toyota, Each
Part Number: RDM-18-0076-A11
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Radiator Cap, Notch Grip, Round, 18 psi Maximum Pressure, Aluminum, Black Powder Coat
Part Number: CHH-3300-007B
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
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