To be honest I was a bit hesitant to order this vacuum pump because of some negative reviews about it. I looked at a single tier but for a few bucks decided to give this one a try. And I'm glad I did. It will make home and automatic air conditioning. I used this to lower the vacuum on my newly revamped AC job on my tracker. And they took it down in 5 minutes. Leave for 1 hour to see if there are any leaks in the system, you're done. I then run the pump for 2 hours before refilling the system. Easy to use, well packaged unit, comes with oil and easy to follow instructions. Would recommend this device.
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