Ideal for heavy duty pressure connections and provides excellent resistance for high temperature applications.

Compatible for use with coolant, water, air, turbocharger bypass valve ports, vacuum ports, throttle body water ports & heater cores.

Reinforced silicone caps are not compatible with fuel, oil, or any petroleum-based products.

Designed specifically to be installed on your cooling system. Vacuum caps have no reinforcement and are intended for vacuum and very little pressure. 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 ASH Reinforced Silicone Caps will withstand the high temperatures and pressures of your cooling system for years to come. ASH 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.