Kozyvacu TA350 Single-Stage Rotary Vane Vacuum Pump for HVAC/Auto AC Refrigerant Recharging, Wine Degassing, Milking, Medical, Food Processing

I had no issues with the pump. It sucked my honda civic system down to-30 very quickly. Ran pump for almost 1 hour straight with no overheating or cutting out. I will say it was 50 degrees outside when I used it. Pump makes some strange sounds when running however it did a great job. After 10 minutes or so the pump was not putting out any mist. The way I understand the manual once mist stops them moisture should be out of the system. The oil that's included was a little more than needed to fill the pump so I have extra if ever needed. Good pump for the occasional users.

This vacuum pump is well built and heavier than I expected. Exceptional quality build. I used it to vacuum my auto AC and it went to about 27 mg in less than 2 minutes. If left for a half and hour it goes down to about 29.5 mg, provided you don't have any air leaks. Its very sturdy and performs exceptionally well. Less noisy than I expected.

I'm happy with this pump after using it twice. I filled the oil half way between the marks, and ran it for over an hour under slight load to break it in, first. (This might not be necessary at all.) It holds vacuum just fine. **It comes with oil in a sealed bottle. After filling up the oil reservoir, you'll have extra leftover. The pump is still working after doing several A/C jobs. **I believe that the pump and other AC vacuum pumps use mineral oil for lubrication. Take opinions on here with a grain of salt!

I read the negative and average reviews. I was really concerned about buying a potential $60 paperweight. I used this way too many times in the past two weeks and am very satisfied with the results. Drop test - passed. Multiple uses - pass. Recommend - yes. I had an accumulator’s schrader valve stick which caused a leak. I have tools to replace the valve while leaving the system pressurized, but this required the accumlaotor to accept the valve and the replacement schrader valve to also be good. Fail and fail. Anyways enter the replacement accumulator and first attempt. The pump worked great and pulled a perfect vacuum. The motor was hotter than expected, but no issues. Charged the system and everything was roses and smiles. Two hours later and after a loud sound of rushing air, I discovered a spring fitting on the new accumulator failed and I lost my charge. Reset the connection and it passed the pull apart test. It appeared solid. Vacuum number 2 - worked great. I turned after pulling the vacuum and promptly sent the pump off the radiator falling to the ground. I got lucky with no damage to the pump or gauges. The gauge line sort of softened the fall. I began to recharge the system. One can in and I had to deal with another issue. Pop goes the same spring connection. Lesson one: don’t buy crap aftermarket AC stuff. Poor quality control. Bought a Motocraft and installed it. (Fit perfect) Vacuum number 3 and everything is still working great. The pump ran for over three hours in 95+ degree weather over the three vacuums. No noticeable oil loss. Solid vacuum. Met my needs and then some. I suspect there will be lemons in any process, but this one worked very well for my needs.

Quite happy here. As others mentioned, this comes with oil. If you fill it mid-way, there's maybe 1/3 of a bottle left over, so you're good for several uses! It pumped my mini-split 16 ft lines down to well below -30, worked great. NOTE: I have no idea of long-term use, I've only used it once.