Valve stem oil seal: 1.Material:NBR,NR,FPM,EPDM and metal 2.Use:Automobile gear box,transmission,engine Subordinate departments;Commercial vehicle oil divisionThe series;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 in reciprocating motion and changing space, control flow into the guide ...