Vibrant Performance's Pressure Relief Valve improves the serviceability of automotive fuel, oil, and coolant systems, by reducing fluid spillage when hoses are removed. When installed at the highest point in a coolant system or component, the Pressure Relief Valve can be used as a bleeder to purge any unwanted air from the system/component. Our Pressure Relief Valve is constructed from 304 Stainless Steel and is black zinc plated. It has been tested for low and high pressure sealing abilities up to 100 psi. The 1/8" NPT body design easily installs with a 7/16" wrench (thread tape recommended). Compatible with automotive fuel, oil and coolant systems.