The HPS Performance 3/8" 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: 3/8" (9.5mm). 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.
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