Description Brass Non Return Check Valve Non return valves are designed to prevent liquid leaking back through, and only allow flow in one direction. Female BSP thread   Non return valve  Up to 10 bar pressure  Manufactured from brass  Suitable for use with diesel or oil  Ideal for use with Diesel tanks, pumps & filters. These valves are designed to ensure liquid flow in one direction only. Manufactured and precision engineered from brass, ensures durability and long lasting corrosion resistance. What is a Check Valve used for? These brass valves can be used in various plumbing applications. Most commonly, non returns are found on the inlet or suction side of a pump to ensure that liquid doesn’t flow back away from the pump, this ensures the pump remains primed.  What else can they be used for? These non return valves can also be fitted as a tank breather, allowing air to escape while preventing it from returning. They can also be fitted to fill lines, to allow liquid to pass through into the tank and preventing any from escaping.  View our full range of fittings by clicking here