Kozyvacu Single-Stage HVAC Vacuum Pump, 4.5CFM - Ideal for AC Repair Tools, Car AC Vacuum Pump, AC Vacuum Pump Kit, and Recovery Machine HVAC - Also Known as Bomba de Vacio A/C (TA450)

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.

I bought this as a backup vacuum pump for my Harvest Right freeze dryer. The pump failed and I replace it with another Harvest Right pump. That pump failed after two runs and was returned. So, I put the Kozyvacu pump into service. It's worked like a champ ever since. I did have to run to Napa to get fittings to make it work with Harvest Right. The new fittings required removing the check valve which means you need to operator the Harvest Right the way you would if the HR vacuum pumps check valve fails (which is a very common occurrence). Pros: 1) Price 2) It works. It gets a small HR to 500mTorr in 4 minutes and a medium HR to 500mTorr in 8.5 minutes. 3) It's much lighter than either the JB or HR vacuum pump. Cons: 1) No check valve 2) Draining the oil for filtering is messier than with either the JB or HR pump. 3) It vents oil vapor on startup. Less than my JB ever did, but more than an HR pump 4) You must buy additional fittings (Napa has them for $12) 5) Works on both my small and medium HR freeze dryers. I don't know how long lived it will be but I'm about 6 months into owning a HR (a small from HR and a medium that was a derelict I found on Craigslist) and I’ve gone through 2 vacuum pumps. The JB with the Craigslist machine was a basket case to begin with, the new HR is still functioning but a backup HR I bought failed after 2 uses. I’m happy with how the Kozyvacu pump works, but it’s not perfect and requires a small amount of disassembly to add the correct fittings. But otherwise it’s a great value and seems robust so far.

The pump arrived on time, and as usual was well packaged. It has only been able to pull my empty vacuum chamber down to -25.5 Hg, but that may be due to my lid seal. I plan to change out the lid seal and retest the vacuum pump. The pump looks good and quieter than I expected. When running, it does produce a very fine mist from the exhaust/oil fill port. I’m told this is completely normal. I’ll post a more in-depth review once I change the lid gasket on my chamber and do a few stabilizing batches. This will be the more in-depth review of the Kozyvacu TA350 after using it numerous times. I have been using it to pull vacuum in a 4”x12” clear PVC vacuum chamber that I built for wood stabilization. During my first runs, I thought this pump may not be able to do the job as effectively as I had hoped. I’m happy to report that is not the case. I’m not sure if it was the crazy Oklahoma weather conditions, the refinements I made to my chamber, or a combination of those, but I’m now able to pull vacuum down to -30 Hg, which is what I’m told is nearly perfect vacuum for the wood stabilization process. Not only does this little vacuum pump seem to be operating better with time, the fine mist I mentioned has stopped. All in all, I’m very pleased with this purchase, and would not hesitate to buy this same pump again. For less than 60 bucks, delivered to your door in a couple of days, this vacuum pump is the “Deal of the day” for anyone like myself who would rather build their stabilization system than buy a complete setup.

I am using this to pull vacuum on vacuum bags for carbon fiber resin infusion. The manual notes that you're suppose to let the pump run through a break in period. I let the pump run for about 30 minutes before I shut it off and drained the oil out of it. I also bought vacuum pump oil with this pump because I did not know that it comes with a bottle of oil to fill the pump back up after the break-in period. I had some trouble getting the oil to show in the sight glass but a little rocking back and forth fixed that. This pump spews oil fog constantly while running. The first time I really used this I had it running for 7 hours straight. It had no problem with this. Other than the fog of oil that filled my garage it pulled more than 30 In/Hg the entire time (my gauge only goes down to 30, but it was past the 30 mark onto the stopper). This machine will not hold vacuum when you turn it off. You will need to clamp the lines or install a ball valve. I did not know this initially and I turned the pump off to inspect a bag. About 10 minutes go by and I notice oil in my resin catch can. The vacuum in the bag had sucked oil back up through the hose. Luckily I had a catch can in-line so no oil was sucked into my composite piece. Overall for the price this vacuum is hard to beat. I have more than 12 hours of run time on this with two fairly long stints. The vacuum didn't get hot during either of them and ran like a champ the entire time. I need to figure out a way to either filter the oil out of the exhaust or re-condense it, but otherwise it's worked well so far.

Great little vacuum pump for ac repairs. Work well. Pulls a full vacuum quickly. Good value for the money.

Re Kozyvacu 5CFM 2-Stage Rotary Vane Vacuum Pump I've used this pump a few times to pull a vacuum for cars A/C. I found it to be efficient and surprisingly quiet. It pulled the maximum vacuum within a matter of minutes. I have left it on for about 1/2 hr with no problems (it obviously got a little hot as expected). Build quality seems fine. Other folks have mentioned the oil mist from the exhaust. I can't comment on if this is normal for vacuum pumps but knowing it may do this I connected a length of pipe to direct the exhaust. This issue wasn't a problem to me. (Note, I chose the 2-stage, 5 cfm model)

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.

excelente materiales

Worked great to evacuate auto AC, well worth the extra over an air operated vacuum pump