we can manufacture many kinds of Mechanical seals, including single face, double faces, single spring, multiple spring, rubber bellow, Metal bellow, Cartridge seal, which can act as the replacement of Burgmann and John Crane seal. Moreover, BoShen can also supply Silicon Carbide (SIC), Tungsten Carbide (TC), Carbon, Aluminium Ceramic(AI2O3), rubber seal, oil seal. If you have any demand, pls contact with me. My email: seals002 at boshengseal dot com.