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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 80 Items.
Radiator Cap, Aluminum, Black Anodized, Round, 13 psi, Each
Part Number: PRO-141-820
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
BUILD IT WITH SUMMIT!
Radiator Cap, 16 psi, Round, Summit Logo, Polished, Knurled O.D., Each
Part Number: SUM-380160
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Cap, Round, 16 psi Maximum Pressure, Billet Aluminum, Black, Flex-A-Lite Logo, for use on Acura®, BMW, Chevy, Chrysler, Ford, GMC, Saab, Each
Part Number: FLX-126845
Estimated Ship Date: Oct 6, 2025 if ordered today
Estimated Ship Date: Oct 6, 2025 if ordered today
Radiator Cap, Round, 16 psi Maximum Pressure, Billet Aluminum, Black, Flex-A-Lite Logo, Buick, Cadillac, Chevy, Chrysler, Ford, GMC, Volkswagen, Each
Part Number: FLX-126844
Not Yet Reviewed
Estimated Ship Date: Oct 6, 2025 if ordered today
Estimated Ship Date: Oct 6, 2025 if ordered today
RADIATOR CAP
Part Number: FLX-126846
Not Yet Reviewed
Estimated Ship Date: Oct 3, 2025 if ordered today
Estimated Ship Date: Oct 3, 2025 if ordered today
Radiator Cap, Notch Grip, Round, 16 psi Maximum Pressure, Aluminum, Black Anodized, Each
Part Number: BSP-BLK75125
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Cap, Aluminum, Polished, Round, 16 psi, Each
Part Number: BSP-75120
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Cap, Notch Grip, Round, 16 psi Maximum Pressure, Aluminum, Polished, Each
Part Number: BSP-75125
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Cap, Aluminum, Silver Anodized, Hexagon, 17 psi, Each
Part Number: GRI-KM84
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Cap, Billet Aluminum, Black Anodized, Round, Plain, 16 psi, Each
Part Number: BSP-BLK75120
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Cap/Gauge, Thermocap, Aluminum, Silver Anodized, Plain, 16 psi, 30-270 Degrees F, Each
Part Number: MRG-2471S
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Cap; Billet Radiator Cap; 16 psi; Knurled Edge; Polished Top; Aluminum
Part Number: CTR-81-116
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Cap, Safecap, Billet Aluminum, Black Anodized, Round, 16 psi, Each
Part Number: MEZ-WCC301
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Cap, Aluminum, Polished, Round, Bowtie Emblem, 16 psi, Each
Part Number: BSP-75320
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Cap/Gauge, Thermocap, Aluminum, Black Anodized, Plain, 16 psi, 30-270 Degrees F, Each
Part Number: MRG-2476BK
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Cap/Gauge, Thermocap, Aluminum, Red Anodized, Plain, 13 psi, 30-270 Degrees F, Each
Part Number: MRG-2470R
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Cap/Gauge, Thermocap, Aluminum, Blue Anodized, Plain, 16 psi, 30-270 Degrees F, Each
Part Number: MRG-2471B
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Caps, Round, Aluminum, Black, Fits 32.000mm Filler Necks, Each
Part Number: VPE-20981
Not Yet Reviewed
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Caps, Round, Aluminum, Black, Fits 42.000mm Filler Necks, Each
Part Number: VPE-20983
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Cap, Octagon, Billet Aluminum, Natural, 16 psi, Each
Part Number: AAF-ALL30139
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Cap/Gauge, Thermocap, Aluminum, Blue Anodized, Plain, 13 psi, 30-270 Degrees F, Each
Part Number: MRG-2470B
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Cap, High-Pressure, Round, 22 to 24 psi, Billet Aluminum, Polished, Each
Part Number: CIR-50-10002
Not Yet Reviewed
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Cap, 16 PSI, Aluminum, Black Anodized, Each
Part Number: PGP-PRP-7651
Not Yet Reviewed
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
Radiator Cap, Round, Aluminum, Natural, Features AC 307 13# Stamping, Chevrolet, Each
Part Number: MMU-25744
Not Yet Reviewed
Estimated Ship Date: Nov 3, 2025 if ordered today
Estimated Ship Date: Nov 3, 2025 if ordered today
Radiator Cap, Round, Aluminum, Natural, Features AC 15# RC-26 Stamping, Chevrolet, Each
Part Number: MMU-25746
Not Yet Reviewed
Estimated Ship Date: Nov 3, 2025 if ordered today
Estimated Ship Date: Nov 3, 2025 if ordered today
Radiator Cap, Round, Aluminum, Black, 16 psi Maximum Pressure, Helix Racing Logo, Each
Part Number: HLX-212-1112
Estimated Ship Date: Monday 9/22/2025
Estimated Ship Date: Monday 9/22/2025
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Summit Racing™ Radiator Caps SUM-380160
