China Nok OEM High-End Bonded Seal Washer NBR HNBR FKM EPDM PTFE O Ring O Shaped Ring Manufacturer 5.5*1.6mm Small Size, Find details about China Customized O-Ring, O Shaped Ring from Nok OEM High-End Bonded Seal Washer NBR HNBR FKM EPDM PTFE O Ring O Shaped Ring Manufacturer 5.5*1.6mm Small Size