THE LOWLY PORT PLUG

Most are either 3/8" for L.P. 7/16"for H.P. & 1/2" for the classics on older U.S. Divers and duty built Dacor. Mostly chrome plated brass but there are Titanium & Aluminum as well. Some same sized port plugs take different size O-rings, have different O-ring lands & overall differing depths! Use caution mixing & matching between manufacturers. This photo represents longevity, we know not many Dive Centers can produce a supply quite like this!