orifice union,union oring, nipple aluminum,socket-weld bosses and couplets,threaded and combination bosses and couplets,threaded, socket weld rough fittings,union, outlet,socket weld, galvanized steel, psi threaded couplet, socket-weld,or combination socket-weld/threaded outlets. Combination and threaded, 3000, 6000, 9000 and 10000 classes. Socket-weld bosses and couplets are available for schedule 40 and schedule 80 (Class 3000), schedule 160 (Class 6000), schedule XXH (Class 9000).