The McAlpine STW85LNL is a 1½" long locking nut designed for use with McAlpine STW 1½" shower traps. The locking nut is used to secure the trap in place and prevent any leaks from occurring. The McAlpine STW85LNL locking nut is made from high-quality materials to ensure that it is strong, durable, and long-lasting. It is easy to install and can be tightened using a standard wrench. When installing the locking nut, it is important to make sure that it is tightened securely to prevent any leaks from occurring. It is also recommended to use plumber's tape on the threads of the trap to ensure a tight seal. Overall, the McAlpine STW85LNL locking nut is a reliable and effective component for use in shower traps. ・ Available in 70 or 85mm sizes ・ Suitable for all 1½" Shower Traps ・ Suit trays with a maximum thickness of 29mm