The Magna Valve is a non-return valve with an internal membrane that opens to allow water to be discharged, then automatically closes to prevent foul smells and sewer gases from entering the building. This product is highly adaptable and suitable for installation under sinks, basins, bidets, baths, and urinals. It can be installed in a horizontal or vertical position and comes complete with 90° inlet and straight compression adapters. It is a waterless trap that won't dry out and won't gurgle. Drain cleaning products should not be poured down the Magna valve.