The Waterway 417-5120 union tailpiece is designed for compatible plumbing applications using a 2 inch flange connection and a 2 inch slip tailpiece. This configuration is useful where the union connection must remain removable while continuing into a same-size rigid plumbing line.Replacing the correct Waterway tailpiece can be a smart service move when the rest of the union remains usable but the plumbing-side connection is no longer in good condition. That helps restore the intended fit while preserving future maintenance access.For compatible union service and plumbing repairs, this Waterway tailpiece is a practical choice when a 2 inch flange-to-slip connection is needed. Waterway union tailpiece 2 inch flange x 2 inch slip tailpiece Useful for serviceable rigid plumbing connections Helps restore the plumbing-side half of the union Supports cleaner and more dependable reassembly