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OER GM Radiator Overflow Jar Caps

Replace that broken, warped, or missing cap on your ride to keep your overflow bottle from leaking coolant with a new one from OER. These radiator overflow jar caps are designed to fit on various GM applications and feature "Engine Coolant Only" stamped right onto them. When you need quality replacements that are as good as the originals or better, equip your ride with the best--OER!

3.96 out of 5 stars ( 28 )

$8.99

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$10.99

Dorman Coolant Reservoir Caps

Dorman coolant reservoir caps are designed to fit over your factory coolant reservoir. They're easily identified by the coolant logo on the top and simply thread on in the stock location. The caps are built from high-grade plastic to withstand high coolant and underhood temperatures.

4.53 out of 5 stars ( 15 )

$3.99

RESTOPARTS® Supplied Coolant Overflow Tank Caps

RESTOPARTS® Supplied coolant overflow tank caps add an authentic look to your engine bay. Available in vented and non-vented styles, each molded plastic cap features the correct, raised white lettering and internal threading for screw-on installation. RESTOPARTS® Supplied tank caps are must-have replacements for your broken or missing coolant overflow reservoirs. Choose the proper fit and style needed for your vehicle.

Not Yet Reviewed

$9.99

Summit Racing™ Radiator Overflow Tank Caps

Summit Racing™ offers radiator overflow tank caps for a variety of applications, including hundreds of Chevy and GMC trucks from the 1970s, '80s, and '90s. These OE replacements are made from factory materials and specs to ensure proper fitment, appearance, and performance. They're ideal if your original is lost or damaged. Each cap meets or exceeds OEM quality standards.

Not Yet Reviewed

$5.99

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$6.99

CA Coolant Recovery Reservoir Tank Caps

CA offers coolant recovery reservoir tank caps for a variety of applications—including many Chevrolet Corvette models from the 1970s, '80s, and '90s. These black plastic replacements are manufactured in accordance with factory specifications to ensure proper fitment, appearance, and long-lasting performance. The caps are available with or without a coolant warning logo.

2.0 out of 5 stars ( 1 )

$8.99