The McAlpine STW85LN is a standard locking nut designed for use with McAlpine STW 1½" shower traps. The locking nut is used to secure the shower trap in place and prevent it from coming loose. The STW85LN locking nut is made from high-quality materials and is designed to be durable and long-lasting. It is compatible with a range of plumbing systems and is easy to install. The locking nut is an essential component of any shower installation, helping to ensure that the shower trap remains securely in place and prevents any leaks or blockages. Overall, the McAlpine STW85LN Standard Locking Nut for STW 1½" Shower Traps is an excellent choice for anyone looking for a reliable and durable locking nut for their shower. Its compatibility with a range of plumbing systems and easy installation make it a popular choice among plumbers and homeowners alike. ・ Available in 70 or 85mm sizes ・ Suitable for all 1½" Shower Traps ・ Suit trays with a maximum thickness of 22mm