The McAlpine STW70LN is a standard locking nut designed for use with McAlpine STW 1½" shower traps. It securely fastens the trap to the waste pipe, preventing leaks. Made from high-quality, durable materials, it is easy to install and suitable for various plumbing systems. The STW70LN ensures the shower trap remains firmly in place, preventing leaks and promoting efficient water drainage. It is a crucial component for any bathroom using a McAlpine STW 1½" shower trap. Available in 70 or 85mm sizes. Suitable for all 1½" shower traps and trays with a maximum thickness of 22mm.