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Your cart is empty.The HPS Performance 5/16" high temperature reinforced Blue silicone cap is designed specifically to be installed on your cooling system. Vacuum caps have no reinforcement and are intended for vacuum and very little pressure. The HPS Reinforced Silicone Caps are manufactured just like our reinforced silicone radiator hoses. With 3 layers of polyester webbing for reinforcement, you can be sure that HPS Reinforced Silicone Caps will withstand the high temperatures and pressures of your cooling system for years to come. HPS Reinforced Silicone Caps are compatible for use with coolant, water, air, turbocharger bypass valve ports, vacuum ports, throttle body water ports, heater cores, and much more. Temperature Range: - 65 deg. F to + 350 deg. F (177 deg. C). Reinforced Layer: 3-ply Polyester. Inside Diameter: 5/16" (8mm). Color: Blue. Wall Thickness: 4mm. Inside Length: 1-3/16". Overall Length: 1-1/2". UV and ozone resistant. Remark: HPS reinforced silicone caps are not compatible with fuel, oil, or any petroleum-based products.
Jason Thompson
Reviewed in the United States on July 6, 2023
Better than the oem rubber
Tommy McGuinness
Reviewed in the United States on May 1, 2020
I purchased three of these bypass valve stoppers for my 2006 Ford Focus, which has a couple extra bypass tubes for the radiator. After blowing thru two manufacturer caps I found this company. These products will literally last longer than my radiator and car itself. Not only was the cap almost impossible to find, with the exception of this company, it is quality freaking stuff. The radiator will literally explode out of its aluminum before this cap fails. Great product and if you’re worried about the price, then just keep buying those cheap vacuum caps and you’ll eventually spend the same amount and some.
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