Socket weld pipe fitting forged pipe fitting Material: ASTM A105, ASTM A350 LF2, ASTM A182 F304/304L, ASTM A182 F316/316L Socket weld pipe fittingsupplies high quality valves ... , bull plug, reducer insert, pipe nipple, outlet, ect.2. Socket-weld or threaded (npt or pt type)forged pipe fittings Size1/8”-4”(6mm ...