These require a pump coupling adapter, SM_522.
Compact 110 volt rotary vane pump motor by RPM. Type C005505, 100 Watt with a 18µF start capacitor, covered cooling fan and mounting bracket. Measures 170 mm (6-3/4") from the pump mounting flange to the back of the fan cover, and 115 mm (4-1/2") tall. Both the start capacitor and power supply leads are loose. La San Marco part number CCEMOT0020/108354A
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.