Specifications Duty oil seals 1.Material:NBR,NR, ... stem seal Subordinate departments;Commercial vehicle oil division The series;Engine oil seal Product overview; Mounted on ... flow into the guide rod and the clearance of lubricating oil. 1. Available material: NBR, HNBR, EPDM, ACM ... 3. Excellent chemical and physical property, excellent in oil resistant, high/low temperature-resistant, wearing-resistant, ...