SKU: ALL 99367
UPC: 848238066982
MPN: ALL99367
The ALLSTAR PERFORMANCE Red Cap Large (ALL 99367) is a universal breather cap designed for engine block drain ports, coolant reservoirs, and overflow tanks in various applications including street, racing, and off-road. This component is essential for preventing coolant loss and maintaining proper system pressure during high-heat engine operation, making it a valuable addition for mechanics and automotive enthusiasts.
Constructed from a durable plastic compound with a bright red finish for easy identification, the Red Cap Large is designed to fit larger-diameter ports. Its lightweight construction, weighing 0.51 lbs, ensures that it adds negligible weight to your engine bay while providing a reliable seal. The cap is engineered for corrosion resistance and compatibility with modern antifreeze formulations, glycol-based coolants, and synthetic blends.
This breather cap is ideal for engine refreshes, cooling system upgrades, and custom radiator installations, especially where OEM caps may not fit. It pairs seamlessly with aftermarket radiators, billet aluminum tanks, and welded overflow bottles commonly used in hot rod and racing builds, making it a versatile choice for any automotive project.
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