KSB 01079781 is a mechanical seal reference with the designation CARTEX-DN/..-00 Q1Q1U1MG-BQ1EMG. The CARTEX-DN denotes a preassembled, balanced dual-cartridge seal arrangement with an integrated shaft sleeve. The material code specifies sintered silicon carbide on both sealing faces (Q1/Q1), with perfluoroelastomer/PTFE secondary sealing elements (U1). The shaft diameter and installation dimensions must be confirmed against the pump before selecting a replacement. The corresponding KE MOTION HYDRO product reference is UCD.