The lip of the waste plug is 30mm high.  Simply screed up to it, or it can easily be cut down to create a customized bed height, that the installer can float directly off it creating the desired bed height every time. Once removed, the Waste Plug leaves a square void, large enough to accept all types of floor wastes, including the ever so popular tile insert/smart wastes. The waste plug is also great for applications when the waterproofing is installed over the top of the bed, as it leaves a void for the membrane to lap down from the bed to the substrate, or leak control flange below.