The Uniwaste™ waterless waste system is unique in design, compact and versatile. It will fit into very tight spaces due to its low level design, ideal for under shower trays, baths, basins and bidets where space is often very limited. The Uniwaste™ waterless waste system has an integral 2-part silicone membrane that prevents foul air from coming up through the system, has excellent water flow capacity and also acts as an air admittance valve when negative pressure occurs in the drainage system. It will also prevent back flow. The Uniwaste™ will fit a waste of 1 ¼ inch and 1 ½ inch push fit or Polypipe at the bottom end. Uniwastes can be adapted at the bottom end for 1 ½ inch pipe with a McAlpine T29 or equivalent compression or solvent adapters. The compression fitting is included for 1 ½ inch pipe.