The McAlpine WM15 is a plumbing component called a "P trap" that is designed to be used in conjunction with a domestic appliance, such as a washing machine or dishwasher. The trap features an adjustable inlet and a 75mm water seal to prevent the escape of foul odors and gases from the drainage system. The trap is designed with a 1½" multifit outlet, which can be connected to a standard plumbing pipe using a compression fitting or a solvent weld joint. The 135° swivel inlet connection allows for flexibility in the installation process, enabling the trap to be positioned in a variety of orientations to accommodate the specific requirements of the installation. In general, P traps are used in plumbing to create a barrier of water that prevents gases and odors from entering a building from the drainage system. The trap works by trapping a small amount of water in the bend of the pipe, creating a seal that prevents the backflow of gases and odors. The McAlpine WM15 is a high-quality component that is designed to provide reliable and long-lasting performance in domestic plumbing applications.