O Rings, Oil Seals manufacturer / supplier in China, offering Acid and Alkali Resistant Rubber Hammer Union Seals Ring for Hammer Union, HNBR FKM PTFE Weco with Brass and Stainless Frac Seal Hammer Union Seals, FKM/NBR/HNBR Filled PTFE Stem U Packing Rod Seal for FC Gate Valve and so on.