Review on 🔧 Efficient 4CFM 1/3HP Single Stage Vacuum Pump & 4-Way Manifold Gauge Set for R410A, R22, R134A, R404A Refrigerants – Ideal for HVAC A/C Refrigeration Recharging and Maintenance, Oil-less Design by Ricardo Fast

Started the first use today. Chinese English manual, you should look at the U tube first, how to use the video. The supplied amount of oil has just reached the minimum fill mark. I had to get a little more from AutoZone to get it midway between min and max. The device worked very well, in about 10 minutes they pumped out the air conditioning lines enough that the pointer was well below a bar. Let it run for 15 minutes, then turn off the pump and leave the gauges fully open for half an hour. The pointer did not move due to the high vacuum below minus 1 bar. The pump worked very well for a cheap device. My new mini split air conditioner works great. Note that the two-page manual that came with the gauge kit shows a completely different gauge than the one that came with it, and it's written more in Chinese. For some reason my sensor set had two yellow leads and separate top and bottom circuits. Only one side used for evacuation.