Grundfos 96658821 is an AQAE-designated seal reference associated with NB 125-250. Its application carries the material-code sequence A/B/C/D/K/M/N/P/S. Retain this sequence with the model designation when describing the required item, keeping AQAE as the separate mechanical seal code attached to the Grundfos number. The corresponding product is listed by KE MOTION HYDRO as NM-13.