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