Pony Rod Oil Seal Kerr KT-3350PT/KA-3500PT (KA-28), molded from ASTM D2000 NBR rubber with sulfur curing (hardness 70±5 Shore A), API 7K-compliant for mud pumps, pressure differential resistance ≥30MPa, salt spray tested 1000h corrosion-free, compatible with ceramic liners for 10000h MTBF, fits EMSCO/FMC series
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