The NB 125-250 listing for Grundfos 96658823 includes material codes A/B/C/D/K/M/N/P/S and mechanical seal code AQQE. The two code types serve different identification roles. Keep the material-code group with the pump application and AQQE with the seal when referring to the OEM number. The related KE MOTION HYDRO product can be found under NM-13.