... . OEM requires optiona Air Conditioner CoilRefrigeration manifold, copper pipe manifold, copper distributor, coil manifold, air conditioner coil manifold, copper manifold, air conditioner coil, air conditioner coil, a/c ... of the section is ≤ ±0.15mm. The surface is processed with non-chromium, oxdization and the performace of welding is fine.