6 CFM Single Stage Vacuum Pump 90066-B 6 CFM free air displacement with ultimate vacuum of 80 microns Refined cartridge machining process creates an improved surface finish extending the longevity of the pump life Upgraded seals insure maximum vacuum Easily removable vapor discharge/oil fill port Large oil level sight glass with max/min level indicator A good quality vacuum pump is an integral tool for complete A/C service. Mastercool vacuum pumps are durable and time tested. They stand up to the most grueling conditions and will provide years of reliable service. S 6 CFM, single stage vacuum pump is suitable for a wide variety applications with an ultimate vacuum of 80 microns, 1/3 HP pump motor and 18 oz oil capacity.