Hansen HiFlo Check Valves are used in-line as a non-return valve to stop fluids from flowing back through your system. Unique design delivers high water volumes with unrestricted full flow saving on pump costs. Screw cap for in-line servicing. No poppet valve to wear or jam. Universal spring and diaphragm (compatible with foot valve). Manufactured from strong, non-corrosive, UV stabilised materials for a long life. Approved for use with potable (drinkable) water.