Product Type: Capacitor Start, Capacitor RunHP: 2RPM: 3450Volts: 115/230Amps: 15/7.5Hz: 60Phase: 1Frame: 56Enclosure Type: ODP (Open Dripproof)Mounting: RigidMotor Diameter: 6-1/2"Shaft Diameter: 5/8" KeyedShaft Length: 1-7/8"Rotation: CCW Shaft EndNumber of Speeds: 1Service Factor (SF): 1.00Bearings: BallThermal Protection: ManualMaximum Ambient Temperature: 40° CInsulation Class: BDuty Cycle: ContinuousCapacitor: IncludedB381 is listed in Century's cross reference as a possible substitute for the following: Century 177836, A.O. Smith 177836, Century 158945, Century 164079, Century 164579, Century 164580, Century 164709, Century 164752, Century 164869, Century 164915, Century 164916, Century 164933, Century 164979, Century 165233, Century 165340, Century 165353, Century 165354, Century 177355, Century 177849Energy Efficient