Standard Poly B Seal Cover (37504000-500B/SG40001), ASTM D2000-22-compliant EPDM rubber (Shore A85±3 hardness), vulcanized一体成型, salt spray tested >1000hrs corrosion-free, API 7K mud pump compatible, dynamic leakage ≤0.02mL/min, UL 157 certified for gasoline/lubricant resistance
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