This replacement compressor motor is commonly used on the small"home/shop" air compressors. The motor is designed to be used with a belt driven compressor. Not to be used where the motor is part of the compressor head. 56 Frame motor has a standard 3" x 5" bolt mounting pattern. Horsepower is designated as SPL. Not to be used where the mount is a pivot type mount. Overall motor length 11.59"; Motor connection diagram on motor name plate. Capacitor Start/Capacitor Run.