The Large Wall Fitting with Threaded OD fits over standard 1-1/2" pipe and threads inside 2" pipe. Features a 1-1/2" FPT opening on the front face and includes a PVC lock nut and gasket for fiberglass or vinyl applications. The large flange camouflages construction variations. Decorative cover p/n DCxxx can be added to update existing installations with new colors. Fitting is made from ABS, and the nut is made from PVC.