The McAlpine TV1 TeeVent is a domestic appliance connector that is designed to connect a domestic appliance, such as a washing machine or dishwasher, to a waste pipe. It is designed to be used with the McAlpine WM4 trap, which is sold separately. The TV1 TeeVent includes a non-return valve, which is designed to prevent backflow of wastewater from the waste pipe into the domestic appliance. This helps to prevent contamination and damage to the appliance, as well as reducing the risk of foul odors and gases entering the building. The TeeVent is made from durable materials and is designed to withstand the demands of regular use. It is easy to install and can be fitted quickly and easily to a range of waste pipes and fittings. Overall, the McAlpine TV1 TeeVent with Non-Return Valve is a reliable and effective component for any plumbing installation that requires a connection between a domestic appliance and a waste pipe. It provides a secure and watertight seal, prevents backflow, and helps to maintain the integrity of the plumbing system. ・ Available with plain end or 1½" Outlet ・ Depending on model, can be connected directly to trap or extended away from the trap using a length of 1½" waste pipe ・ For use with WM4 Trap ・ incorporates a Non-Return Valve, which provides an air break and enables the waste system to be sealed ・ Should a blockage occur, the Non-Return Valve prevents flooding