Designed for use with all preformed shower bases; fiberglass, acrylic, nylon or metal. Solvent welds over 2" Sch. 40 DWV pipe. Fiber and rubber gasket provides a tight seal to the base. Heavy duty 4 1/4" strainer. Allows lower section to be solvent welded over 2" Sch. 40 DWV pipe before the shower stall is set in place. Upper section comes with a locking wrench for easy tightening.