Response to Dan- The UST1152 A.O. Smith 1.5 HP Round Flange Up Rate Motor (C48L2N134) will not replace the ST1152 A.O. Smith Round Flange 1 1/2 HP Full Rate Motor (C1101, ST1152). The ST1152 is full rated and has a higher total horsepower than the UST1152. The Serive Factor on the UST1152 is 1 the Service Factor in the ST1152 is 1.5.

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