... Engine 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 ... Available material: NBR, HNBR, EPDM, ACM, MVQ, Viton (FKM), PTFE, etc.Wide range of material is available. 2. All manufacturing ... . State standard and non-state standard sizes available. Valve stem Oil Seal