Product Description Description: A Non Return Valve permits the flow of water in one direction only. The addition of a Non Return Valve between your water tank and your water pump is recommended for all installations where a water pump is being connected directly to a tank Features: A required accessory when installing all HW pumps and some Jet pumps. Allows the water to flow in a single direction only, maintaining pressure in line or pressure tank Indispensable for garden pumps and domestic water systems Thread 1″ UPC: 4003718023312 Enquiry Tell A Friend