... 1.Material:NBR,NR,FPM,EPDM and metal 2.Use:Automobile gear box,transmission,engine Subordinate departments;Commercial vehicle ... located between stem and valve guide. To adapt to the stem and catheter in reciprocating motion and changing space, control flow ... 's requirements, any specification is welcome according to your requirements. 5. Available in various sizes and colors. 6. State standard and non ...