Response to Hello Charles.  The Century Motors 1/2 HP Full Rate Motor SQ1052 (.95 THP - total horse power) is a compatible replacement for the motor part number 168451.   Century 1/2 HP Square Flange 48Y Full Rate Motor - SQ1052       The Century Motors 1.0 HP Up Rate Motor USQ1102 (1.25THP) is also a compatible replacement.  Century 1.0 HP Square Flange 48Y Up Rate Motor - USQ1102  it is recommended that the motor shaft seal, seal plate gasket and diffuser gasket be replaced concurrent with the new motor.  These parts are specific to the pump and not the motor.  Please provide the pump manufacturer & model and a recommendation can be made.

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