This is a Robinair is great. Robinair makes some of the best HVAC products. This vacuum pump can fill a large system in no time and reduce to 400 microns in about 30 minutes. I like to run it longer (sometimes an hour or so) so I know there may be in the system evaporates any moisture that has got in. I have had this pump for some time and have been very impressed with its performance.I would highly recommend this vacuum pump.
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