The Wavin Sewer Adjustable Gully is designed to collect waste water and prevent foul smells from escaping the drainage system. It comes with a unique gully grid that's recessed to prevent splashing from rainwater or waste outlets. The gully also features an aperture socket to accommodate a 110mm sewer pipe, allowing you to adjust the height of the hopper to suit your specific needs. The gully is 4 inches in size and includes the gully grid and aperture socket.