... SGS approval 3. ISO9001 quality certificate 4. OEM requires optional U-Bend Copper Fitting Copper fitting, cu fitting, pipe fitting, ... , air conditioner fitting, copper return bend, u bend, y bend, copper tripod, cu u bend with rings, copper manifold, copper distributor, copper ... the section is ≤ ±0.15mm. The surface is processed with non-chromium, oxdization and the performace of welding is fine ...