Stuart Turner non-return/ check valves for universal shower pumps inc monsoonSTUART TURNER NON RETURN VALVES TO SUIT UNIVERSAL NEGATIVE PUMPS IF YOUR PUMP IS TURNING ON WHEN A TAP OR OTHER OUTLET IS NOT OPENED OR IT IS PULSING, IT'S LIKELY THE NON RETURN VALVE(S) HAS FAILED AND WATER IS BEING ALLOWED TO RUN BACK TO THE PUMP, FORCING THE PUMP TO TURN ON IN AN ATTEMPT TO REPRESSURISE GET IT FAST SENT ROYAL MAIL 1ST CLASS INCLUDED: 2 X NON RETURN VALVES ('CHECK VALVES') 2 X O RINGS TO SEAL THE BASE OF THE BRASS SECTIONS FITS