This is a single stage vacuum pump used to evacuate air and moisture from an A/C system after servicing the system is complete. Once all the air and moisture is removed the system is ready to be charged with refrigerant. Features: 5 CFM free air displacement. 110 Volts, single stage design. 1/4 inch flare and 1/2 inch acme intake ports. No-hassle over the counter replacement warranty.