Above ground swimming pool and spa motors. These are called Thru-Bolt mount motors as the pump mounts to the face of the motor with the motor thru bolts. 48Y frame motors thru bolt dimension is 5 1/8" on center measured across the shaft. Shaft is 1/2" diameter with threads on end. Motor has flat-rigid base welded to motor case. Wiring connection diagram on motor name plate. These motors are found on the Hayward Powerflo, Waterway, Aquaflo, Dynamo and many other above ground pool and spa pumps. 1 Year Manufacture Warranty.