... weld ball 1. specification:1/8'' - 4'' 2. material: AISI 304, 316 3. widely used in hose connection stainless steel 304 ... : AISI 304, 3163. widely used in hose connectingQiancheng Stainless Steel Products Co.,Ltd, situated in foundry country of china--- ... wax-molding fine technique, could produce all kinds of stainless steel and carbon steel pipe fittings,including couplings, nipples, valves, elbows, ...