Engineered for vinyl liner and fiberglass pool installations, the Hayward SP1411 fitting assembly serves as a versatile wall return or suction point. It features a 1.5-inch Male Pipe Thread (MIP) outer connection with a 1.5-inch Female Pipe Thread (FIP) interior socket, allowing standard directional eyeball inserts, vacuum adapters, or winter plugs to screw directly into the wall face.