Shaft Seal for CR1/3/5 Pump – Shaft Dia 12mm

he shaft seal for CR 1/3/5 pumps features a 12 mm shaft diameter and is a precision mechanical seal designed to prevent fluid leakage along the drive shaft of Grundfos CR series centrifugal pumps used in chemical dosing, water supply, and cleaning applications. It maintains a dynamic, fluid‑tight barrier between the pump’s wet end and the motor drive shaft, and its correct functioning is critical for pump reliability and for preventing chemical leakage that could cause contamination or safety risks. Dimensioned specifically for the 12 mm shaft of the CR1, CR3, and CR5 pump series, this genuine replacement shaft seal enables a precise, correctly specified pump overhaul to restore pump integrity and extend service life.