McAlpine MACVALVE-4 2" Self Closing Waste Valve Compression x Compression

Great for fitting horizontally or vertically. Perfect to stop smells and backflow. With no water seal, it can never dry out through evaporation or lack of use, as the membrane remains sealed.Can be fitted in the horizontal or vertical positionThe Internal Membrane opens under water pressure to allow the discharge to flow freely and then closes to form a seal to prevent foul odour or sewer gas entering the building.2? x 2? Universal Compression ConnectionsThe Non-Return Valve shall prevent problems with waste backflow or back pressure in the discharge pipe system.Easily removed for maintenance of the discharge pipeworkBefore installation test that the membrane is opening and closing.