ValvesThread fittings fully compatible with BSPT. In-line check valves stop fluid drip when flow stops, keeping hose full and reducing initial dry cutting.Can be used with coolants, fluids and air lines. Suitable for all wet machining, spark erosion and air line operations up to 50PSI air and 30PSI liquid. Flow direction is easily and accurately positioned with no spring-back. All parts are fully interchangeable and fully replaceable. Manufactured from Acetal - non-conductive and chemical resistant. Available with 1/4, 1/2 and 3/4 bore. Hose is blue, all other fittings are orange. Threaded fittings are fully compatible with BSPT.