The Hayward SP1023S is a 1.5-inch SKT (slip) inlet/return wall fitting with locknut and gaskets. It has a white plastic body and nut, includes rubber gaskets, features a 1.5-inch glue-socket connection on the backside and 1.5-inch internal threads on the face for directional inserts, and fits a 2-3/8-inch wall opening. Compatible with fiberglass or vinyl pool and spa walls, including above-ground installations, and accepts 1.5-inch directional eyeballs, plugs, grate inserts, outlet covers, and JetAir hydrotherapy fittings.