The McAlpine WM4 is a 75mm water seal adjustable inlet tubular swivel 'P' trap with a 1½" multifit outlet. It is designed with a 135° swivel inlet connection for the discharge from a domestic appliance via TeeVent. The adjustable inlet allows for the trap to be easily installed and positioned, while the swivel connection allows for easy alignment with the appliance outlet. The trap has a water seal to prevent foul odours from escaping into the room, and the multifit outlet can be connected to a range of different pipe sizes and materials. Overall, the WM4 is a versatile and reliable solution for trapping wastewater from a domestic appliance.