... :various type 3.application:heavy truck 4.ISO9001 Valve Stem Oil Seal for Heavy Truck :Valve Stem Oil Seal for Heavy Truck:1.In ... : high quality NBR/FPM/Viton2.application:for car or motorcyle ,valve stem,machinery and so on3.with excellent heat-resistance and Improved ... , water pumps, valves, etc. MaterialVITON,FPM,NBR, SILICONE, HNBR, CR, PTFE, EPDM, etc. Can choose on your requirement; TypeTC, TB, TA ...