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China Industrial Sanitary Pneumatic Electric Motorized Solenoid Water Butterfly PVC Ball Wafer Type Valves Stainless Steel DN50 DN300 CE Valve. hick end cap, excellent resistance against air supply working pressure. Deep spring bore for reliable spring positioning. Dark finish after four times hard anodizing treatment, excellent abrasion & damage resistance. Black piston with anodizing & deep finishing treatment, high hardness and convenient for spring assembly. Material: Grade 65 carbon steel.