LTS-31 SC Cartridge seals are self-contained units consisting of a shaft sleeve, seal, and gland plat. The unit is fitted onto the pump shaft as a built assembly, and no further fitting is required. Cartridge seals are an attempt to over-come the fitting problems of conventional seals. They are supplied in single and double form, and the gland plat is often fitted with various tappings to provide for flushing, cooling water injection, and disaster control.