PN# 637010 was used in our 4:1 ratio Stainless pumps - (NM2304B-X1-X11). This was used to repair the pump lowers (65106-X, 65108-X, 65108-5 and 66496).
A few years ago, the lower pump end nomenclature changed. The kit part numbers changed at the same time they changed the lower pump part numbers.
The only difference between 637010 and K1875C11SS00 is as follows:
The only difference between 637010-4 and K1875C11FF00 is as follows:
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