... .surface treatment:powder coating, painting, spraying,etc OEM cnc cast iron valve body Specifications cast iron valve body ... aluminum, zinc etc2sandgreen sand, sodium silicate sand etc3mahinelathe, CNC, drilling machine, milling machine, boring machine, planting machine, machining center4processsand casting, investment casting, lost wax ... be checked 3 times before packing. OEM cnc cast iron valve body