Head
5 m → 5 m
Replacement record
Grundfos ALPHA2 25-50 is no longer the current model.This is what replaces it.
Grundfos ALPHA2 25-50 is superseded by Grundfos ALPHA3 25-50. A wholesaler listing the old number as unavailable is not the same as the part being gone.
Side by side
What changes, and what does not.
Old value first, replacement second. Where a figure is missing, we have not published one rather than estimate it.
Connection
G 1 1/2 → G 1 1/2
Before you order
A documented replacement is not a fitting decision.
This record says what the catalogue holds about these two parts. It does not confirm that the replacement fits your installation, is in stock, or is safe to install — that is for a professional looking at the actual part. Identification is at component level, not an official manufacturer endorsement.