polyurethane seal Good sealing, water resistance, oil resistance OEM,ODM available ISO9001,SGS,ROHS Lead time:30 ... ,EPDM,CR,TPE,PVR,PC,PE,PP,PS,POM,PUR,PVC,PPTV,HIPS,ABS,EPE,EVA etc.,with hardness between 30 ... you modify your enigine for race tolerances and performance. polyurethane oil seal ring