The McAlpine SH10 is a plumbing component that is used in the drainage system of a sink or basin. Specifically, it is a "running" trap, which means that it is constantly filled with water and helps to prevent foul odors and gases from entering the room. The "S" shape of the trap allows for a water seal to be created, which prevents any gases from coming back up through the drain. The 75mm water seal refers to the height of the water column in the trap, which is the distance between the highest point of the trap and the level of the water in the trap. The swivel design of the trap allows it to be easily connected to the waste pipe, while the multifit outlet means that it can be used with a variety of different pipe sizes and types. Overall, the McAlpine SH10 is a reliable and effective trap that can help to keep your plumbing system running smoothly. ・ Available in 1¼", 1½", and 2" sizes ・ 75mm Water Seal ・ Multifit Compression Outlet suits all plastic, copper and lead pipe ・ Manufactured in polypropylene ・ Conforms to BS EN 274-1:2002