A variety of miniature fittings in type 303 stainless steel have been introduced by Industrial Specialties Mfg. Inc. Sizes range from 1/16 - 3/8 inches I.D. and 10-32 through 3/8 inches NPT threads. Fittings are available as straight connectors, elbows, tees, y's, crosses, reducers, adapters, nipples, plugs, bulkheads and swivels. These chemically resistant units offer numerous design options, and Industrial Specialties also can manufacture special sizes and materials. Industrial Specialties.