The McAlpine BT2 19mm Water Seal Adjustable Inlet Tubular Swivel P Trap with Multifit Outlet is a plumbing fixture used to prevent sewer gases from entering a building through the plumbing system. This particular trap has a 19mm water seal and an adjustable inlet, allowing it to fit a range of pipe sizes. The swivel P trap design allows for easy installation and cleaning, and the multifit outlet is compatible with a range of waste pipe sizes. Overall, the McAlpine BT2 trap is a versatile and reliable option for plumbing systems in residential and commercial buildings. It is available in 1 1/4 inch and 1 1/2 inch sizes. Features include a 19mm Water Seal, Multifit Compression Outlet that suits all plastic, copper and lead pipe, and an Adjustable Inlet which makes the trap suitable for all domestic repair, maintenance and improvement work. Manufactured in polypropylene.