Product Details: The Bendix DC-4 Series 1/4"-18 NPT Female Double Check Valve is designed to prevent backflow of fluids, ensuring that the supply port remains free from contamination. Constructed of high quality materials, this valve is reliable and long lasting, able to withstand harsh environments and extreme temperatures. This double check valve is the perfect solution for a variety of applications, providing a reliable and secure solution. FleetPride is your First Click in Heavy Duty®.