seal(o ring oil seal stem valve seal rubber plug stopper) Materials:NBR,NR,FPM ... ,EPDM, silicone, SBR,PU Specifications: Molded seal(o ring oil ... seal stem valve seal rubber plug stopper)Materials: NBR, NR, ... , high/low temperature-resistant, wearing-resistant, oil-resistant, voltage-resistant,ectSpecifications: not standard, OEM ...