Viva Sanitary 40mm (1.1/2") Magna Self-Sealing Waste Valve.

The Magna Valve is a non-return valve with an internal membrane. The valve opens to allow water to be discharged, then automatically closes to prevent foul smells and sewer gases from entering the building. This product is very adaptable, and is suitable for installation under sinks, basins, bidets, baths and urinals. Can be installed in a horizontal or vertical position. Complete with 90° Inlet and Straight Compression Adapters.Waterless trap that wont dry out and wont gurgle.Drain cleaning products should not be poured down the Magna Valve.