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John Crane 58u 59u 58b 59b Mechanical Seal Silicon SS316 PTFE Seal. Wide Compatibility: Identical to Brg BT.C5.KU, Aesseal M03S, John Crane 58U, and Sterling 259S seals. OEM Customization: OEM and customized products are welcomed to meet specific requirements. High-Quality Materials: Constructed with Silicon, SS316, and PTFE for corrosion resistance. ISO9001 Certified: Factory has gained ISO9001 authentication ensuring quality control. Fast Delivery: Off-season lead time within 15 workdays; peak season one month.