NON RETURN VALVE HEAVY DUTY

A parallel BSP‑thread, stainless‑steel, spring‑loaded non‑return valve is a compact check valve designed to let water flow in one direction while preventing backflow. The defining features are the parallel BSP (British Standard Pipe) thread, which ensures compatibility with marine and plumbing fittings, and a stainless‑steel spring mechanism that closes the valve automatically when flow stops. This makes it well‑suited for bilge systems, freshwater lines, and general marine plumbing where corrosion resistance and reliability matter.