D18 Self Cutting Drain away kit, washing machine, dishwashers non return valve.. DRAIN AWAY KIT Use this to create a washing machine or dishwasher waste connection, anywhere on a 1 1/2" or 1 1/4" plastic Waste pipe. Simple to install Clamp the saddles to the pipe Cutter is inserted and screwed in to the saddle until a hole is cut through the pipe Screw the elbow to the saddle  Push drain hose onto spigot and secure with jubilee clip(not provided) It has a built in non return valve which prevents back flow of odours