I used the Harbor Freight AC gauge set and vacuum pump. YaeTek 4CFM 1/3HP Rotary Vane Air Vacuum Pump HVAC A/C Refrigeration Kit AC Manifold Gauge Set w/Leak Detector R410a R134a R12 R22 R404 4.0 out of 5 stars 17. 3. Includes 6 ft. hose, brass manifold, vacuum pump & manual couplers. The Vacuuming Action. Condition is Used. 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Close the Low-Side Valve The first valve to close will be the low-side gauge, which is typically blue. Manifold Gauge Sets are a crucial tool for any technician. Vacuum pump oil is provided. It comes with power cord, cable and 531 type tube. It designed to work more effectively for any job. Once the desired vacuum range is achieved, you can shut off the vacuum pump and close the gauge … $258.05. Proper way to "pull" a vacuum from a discharged auto AC system. XtremepowerUS 3CFM/4CFM Air Vacuum Pump & HVAC AC Manifold Gauge Set. It works by creating vacuum through isolating the gases and then releasing them into the atmosphere. 2. AC Flush Kits. The vacuum pump also fitted with sight glass for minimum and maximum oil level. Vacuum Pump Oil. 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