valve oil seal 20 years experience trustworthily 1.Good Quality 2.Various Material ... material f or Oil Seal, Rubber Oil Seal, Rubber Seal, O-Ring,Rubber O-Ring,Rubber Ring Seal and Rubber Gasket like: NBR, HNBR, CR ... . Optional color for you of the Oil Seal,Rubber Oil Seal,Rubber Seal, O-Ring and Rubber Gasket: Black, red, yellow, brown, white, green ...