SOCKET-WELDING AND THREADED ANSI B16.11 SOCKET-WELDING REDUCER INSERT MSS SP- 79 STEEL PIPE UNION MSS SP- 83 Socket welding and threaded SWAGE AND NIPPLES MSS SP- 95 FORGED CARBON STEEL BRANCH OUTLET FITTINGS MSS SP- 97 Socket welding, threaded and buttwelding end