Valve stem oil seal: 1.Material:NBR,NR,FPM,EPDM and metal 2.Use:Automobile gear box,transmission ... oil sealProduct overview;Mounted on the catheter valve upper and / or lower, located between stem and ... valve guide. To adapt to the stem and catheter ... clearance of lubricating oil. 1. Available material: NBR, HNBR, EPDM, ACM, MVQ, Viton (FKM), PTFE, etc.Wide range ...