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Heat-Resistant Materials for Engine Seal Rings Oil Seal 20*30*4. Wide Material Selection: Available in NBR, FKM, EPDM, Silicone, and other specialized rubber compounds. Customization Options: Full customization available based on drawings, samples, and specific designs. High Performance: Features excellent temperature resistance, oil resistance, and sealing performance. Fast Delivery: Stock items delivered within 3-5 working days after payment confirmation. Free Sample Service: Free samples provided, customer only pays for freight costs. Strict Quality Control: Includes first, patrol, initial, full, and shipment inspections plus third-party acceptance. SGS Certified: Products have passed SGS certification with ongoing patent applications.