Piston Cup 3.0 OD Pro Gold (SKU P557561), forged from ASTM D2000-20 Type 2 Class B1 NBR rubber with precision vulcanization (3.0"OD), API 7K-compliant for mud pumps, pressure differential ≥35MPa, salt spray tested 500h corrosion-free, ISO 3601-1/DIN 3771 certified, 45% dynamic sealing longevity enhancement
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