【Package Include】1PCS 3/4" NPT Female thread check valve. 【Solid Brass】The entire body of this check valve is made of solid brass, which is strong and not easily corroded, suitable for long time use. The internal spring is stainless steel. No cheap and flimsy aluminum or plastic material. Working pressure is 200PSI. Operating temperature range is -40 to +250℉(-40 to +121℃). 【Heavy & Thick】The port of the premium forged brass check valve is carefully designed with precision threads, which is easy to install and connect. Large-caliber connection means higher working efficiency, greater flow, and compact and reliable valve body structure. 【Great Tool】The check valve are respectively for tube connecting, mainly used for the one-way flow of the medium in the pipeline, which only allows the medium to flow in one direction to prevent the medium from back-flow. Mark the direction of the liquid inlet, which is convenient to use and effectively prevents the liquid from flowing back. 【Widely Used】The check valve can be used in fluid systems to prevent fluid back-flow, or in pneumatic systems to prevent compressed air back-flow, reducing accidents and ensuring normal work. Widely used in pump and compressor discharge cooling towers, HVAC systems, pressure pumps, sump pumps, condensate line, boilers and other applications to prevent back-flow. Solid Brass In-line Spring Check Valve 3/4" NPT Female Thread One-Way Non-return Prevent Water Back-flow