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Explicit manufacturer interchange
Sterling Electric 238/2238AQ appears in the same manufacturer-published cross-reference row as Boston Gear F724B at Match installed ratio · 2.38 in center distance.
Sterling Electric explicitly marks the listed competitor models "Yes" for interchange with 238/2238AQ at 2.38 in center distance in its 2000RA Style AQ Interchange Guide. Rows marked No are intentionally excluded.
The manufacturer explicitly marks the compared model as an interchange in its published table.
Boston Gear F724B and Sterling Electric 238/2238AQ are tied by the published source at Match installed ratio · 2.38 in center distance.
Still verify the exact configured ratio, input/output interfaces, duty, accessories, and installation conditions.