O Ring, Oil Seal, Hydraulic Seal manufacturer / supplier in China, offering DIN Standard Plastic 20-110mm UPVC PVC Pipe Plate Connection Joint Flange Socket Head Plastic Pipe, PTFE Composite Diaphragm Air Operated Double Pneumatic Diaphragm Metering Pump Parts Pressure Plate, PVC Plastic UPVC Dosing Metering Pump Parts Regulator Double Union Back Pressure Safety Relief Ball Valve for Water Media and so on.