Series B 5.5" Replacement Rubber Seal (SKU: 303077) ASTM D2000-standard NBR rubber with optimized vulcanization crosslinking (≥90% density), hardness 70±5 Shore A, oil resistance ISO 1817 Class B, compatible with API 7K mud pump sealing grooves (pressure differential ≥35MPa), surface roughness Ra≤0.8μm, NSF61 drinking water safety certified
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