Response to Hello Eric.  The Century Motors 1.5 HP Dual Speed motor model SQS1152R has a Total Horsepower (THP) of 2.21.  The Hayward MaxFlo XL pump model SP2310X152 was originally manufactured with a 1.65THP motor.  Technically the SQS1152R is a compatible replacement.  The Century Motors Dual Speed motor model SQS1102R has a THP of 1.65.  The SQS1102R is less expensive than the SQS1152R.  Century 1.0 HP Square Flange 48Y Dual Speed Full Rate Motor - SQS1102R  It is recommended that the motor shaft seal be replaced at the same time.  Please see attached.  Pump Shaft Seal 5/8" - - SPX2700SA PSR-200

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