Very Reliable Valterra Double Union Spring Non Return Valve, this Double Union Spring Non Valve has minimum resistance also with the advantage of waste particles that can be removed by unscrewing the double union fittings.
The Double Union Spring Non Return Valve provides a simple means of preventing backflow in pipe work where this would be undesirable.
This Double Union Spring Non Return Valve (swing check) Valve is probably unique in its design and is the first we have been able to find where the valve can be viewed for periodic cleaning etc.
The Spring type non return valves create little back pressure on the pumps and the swing check just swings out the way.
Truly a superb piece of kit, it will fit any 1.5 inch, 2 inch imperial pressure pipe and is solvent weld also. Reducing sleeves can also be glued in the socket unions to use these flapper valves with normal Black Solvent Waste Pipe.