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 ・ Available in 1¼" and 1½" sizes ・ 19mm Water Seal ・ Multifit Compression Outlet suits all plastic, copper and lead pipe ・ Adjustable Inlet makes trap suitable for all domestic repair, maintenance and improvement work ・ Manufactured in polypropylene