OEM casting coupling pipe fitting 1.iron, steel, alloy etc. 2.die casting 3.ISO 9001:2000 4.X-ray, CMM OEM casting coupling pipe fitting is one of our key products ... ..Casting ProcessClay sand casting, furan resin sand casting, shell mold casting;Water-glass sand casting, water-glass investment casting, lost-wax investment casting;Die casting, sand casting, lost-wax casting ...