Variations Total options: 2 Color;2 Material;1 Style. Select now 1. Color(2): Black Black Blue 2. Material(2): NBR NBR FKM 3. Style(1) COMBI oil seal Oil seal is a common term for general seals, which simply means the sealing of lubricating oil. It is a mechanical component used to seal grease (oil is the most common liquid substance in the transmission system, also referring to general liquid substances). It isolates the parts that need lubrication in the transmission components from the output components, so as not to let lubricating oil leak. Seals used for static and dynamic seals (usually reciprocating) are called oil seals. https://www.xtnbk-autoparts.com/products/combined-oil-seal-tractor-combi-seal-agricultural-machinery-oil-seal-rubber-material-651605-651831.html