General description The McAlpine BT4 is a plumbing fixture known as a "P-trap," designed to prevent foul odors and sewer gases from entering a building through the drain system. The "P" shape of the trap holds a small amount of water, creating a barrier that prevents gases from passing through. This model features a water seal depth of 50mm, which is the distance between the water level and the lowest point of the trap's bend. The 1¼" multifit outlet allows for connection to various pipe sizes, while the swivel feature enables rotation or adjustment to fit different plumbing configurations, ensuring a secure fit. Technical specifications Water seal depth: 50mm Outlet size: 1¼" multifit Other information Conforms to BS EN 274-1:2002