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Manufacturer-published selection
Falk / Rexnord 5307J25A appears in the same manufacturer-published cross-reference row as Falk 4000 4307J25C at 25:1 · AGMA size 307.
Rexnord Table 1 publishes Falk 5307J25A with the listed competitor models for a 15 hp / 20 rpm selection at 1.0 service factor and 25:1 nominal ratio.
The manufacturer publishes the target as the selection for the stated competitor size, ratio, or duty point.
Falk 4000 4307J25C and Falk / Rexnord 5307J25A are tied by the published source at 25:1 · AGMA size 307.
Verify the installed unit against the source assumptions and current manufacturer ratings before purchase.