... (front and back) aluminum alloy(or cast iron, cast steel)valve body, valve core, valve stem, splint, pull rod and or so other parts ... and Maintain:1,Our Pinch Valve’s measurement is Accord with Machinery industry standard, when leave the factory, it must be checkout ... abrasion or leaks, just to remove the valve to replace a new valve core, the valve can use for a long time for ...