Waterway 400-9170B Return Wall Fitting AssemblyThe Waterway 400 9170B is a white return wall fitting assembly in the Waterway Return Wall Fittings line with a 1 1 2 in FPT thru connection. It is molded plastic and includes a threaded retaining nut and gasket; dimensions are a 2 3 8 in wall hole size and a 3 1 2 in face diameter. Compatible with standard vinyl liner pool return ports and plumbing that use 2 3 8 in wall openings and 1 1 2 in male pipe threads.