McAlpine Self Closing Waste Valve with BSP Female Inlet Nut x Compression Outlet 1.25in x 1.25in MACVALVE-3

McAlpine self-closing waste valve is manufactured from acrylonitrile butadiene styrene (abs) making it resistant to corrosive chemicals and physical impacts. This equipment features a membrane that opens under water pressure to allow discharge to flow freely and then closes to form a seal to prevent foul odour or sewer gas entering the building. It has a no water seal so it can never dry out through evaporation or lack of use of an appliance as the membrane remains sealed. This valve is supplied with a tundish adaptor measuring 1 1/4in BSP male thread x 22mm universal inlet.