Rubber O Ring, Rubber Seal, Rubber Product manufacturer / supplier in China, offering Figure 1002 Hammer Union NBR FKM Seals for Harsh Drilling Environments, Oil-Resistant HNBR FKM PTFE Wing Hammer Unions Seals for Sour Gas Service, Reliable Heat Resistant Elastomer 1002 Hammer Union Seals for Union Pipeline and so on.