longshen seal manufacturer Co, Ltd, is one of the manufactures and exporters of mechanical seals in family water pumps, petroteum industry, paper-making and so ***** longshen has developed a series&1000 sizes of mechanical seal, which can replace the similar products of John Crane&***** also supplys various sealing materials such as:silicon carbide, Tungsten Carbide, *****, Teflon and Industrial Rubber (oil seals)ect.