OMT 4.5 CFM Single Stage Vacuum Pump for R134a R410a R22 Auto AC HVAC Kit

I purchased this vacuum pump specifically for evacuating my vehicle's AC system before recharging it, and I'm pleased to report it performed exactly as needed. For anyone doing their own AC work or HVAC repairs, this pump delivers solid performance at a price point that makes it an attractive alternative to more expensive professional-grade options. Performance on AC Systems The pump pulled down my AC system efficiently and reached the necessary vacuum level without any issues. It handled the job smoothly, maintaining consistent suction throughout the evacuation process. The gauge readings were stable, and the pump achieved the proper vacuum depth required for removing moisture and air from the system before introducing new refrigerant. This is exactly what you need from a vacuum pump—reliable performance that gets the job done correctly the first time. Exceptional Value What really stands out about this pump is the value proposition. AC vacuum pumps can get quite expensive, especially if you're only an occasional user rather than a professional technician. This pump provides the functionality you need without the premium price tag of top-tier brands. For DIY mechanics or homeowners who occasionally need to service AC systems, the cost-to-performance ratio is excellent. It's affordable enough that you don't feel like you're making a huge investment for a tool you might only use a few times a year. Build Quality and Longevity Based on my initial experience and inspection of the pump, it appears to be well-constructed with durability in mind. The housing feels solid, the components seem robust, and there's nothing about the build quality that raises red flags about premature failure. While only time will tell for certain, all indications suggest this pump should provide reliable service for many years. It doesn't have that cheap, disposable feel you sometimes get with budget tools—this seems like equipment that's built to last through multiple jobs. Would I Buy It Again? Absolutely. If I were in the market for another vacuum pump or needed to recommend one to someone else, this would be an easy choice. That said, based on how well it's holding up and how solidly it's built, I don't anticipate needing a replacement anytime soon. This appears to be one of those purchases where you buy it once and it serves you reliably for the long haul. Final Recommendation For anyone needing a vacuum pump for AC work, HVAC repairs, or similar applications, this pump hits the sweet spot of performance, quality, and affordability. It does what it's supposed to do, it's built to last, and it won't break the bank. Whether you're a DIY enthusiast tackling your own AC repairs or a professional looking for a cost-effective backup pump, this is a solid choice that delivers excellent value.

Used this twice now to pull vacuum on classic car a/c systems without any issues. Pump is pleasantly quiet from what I thought it would be and it pulls a vacuum quickly. I am very pleased with the purchase and would recommend it to any other mechanic that needed a value priced a/c vac pump.

Quick to pull down, little noisy and smokey but hey... for the money, I can deal with it. No issues at all, valuable tool to add to shelf for future jobs

Good vacuum, max -25 on my gage, and very quiet. Don't try to run without quick hard vacuum as oil laterally fogs out the fill cap if none or low vacuum. Of course, that will tell you that there's a leak! Throw some shop towels on the cap and clean up the mess. Runs VERY hot. Can't touch the pump. Probably has a short life, but it's cheap. Good for very light use.

It worked great, I was replacing a compressor, both evaporator cores, and a drier in a front/back system that was apart for a while in a very humid environment. Because of that I decided to run it for 2 hours, which is essentially the top end of what anyone would recommend, it was in the shade on a cooler day, but still ended up getting very hot, like burn your hand hot, though it didn't fail. I didn't see anything about duty cycle in the manual, so I didn't think it'd be an issue, but I'd recommend not running it for more than an hour at a time with a decent break in-between, also if it's super hot outside/not in shade I'd be really careful with how long it runs, maybe just 30 minute increments or have a fan blowing on it and constantly check it's temp.

Pulled good vacuum. I was able to pinpoint where the leak was in my a/c system. Replaced parts and vacuum and recharged system successfully. Compatibility with home ac, auto, and many more uses. I had ample amount of hydraulic pump fluid also

It seems every product has a few reviews that say things like "Junk", "Trash'', or "Don't buy" etc. I tend to disregard those if there are many many positive reviews. In my case, the former were correct. It comes with a bottle of oil which has to be added before use. On the first use, once I vacuumed down to about 280 microns, I either had user error or a leak because when I turned off the pump, my micron gauge went crazy so I thought I had a leak I tightened the connections and tried again--same result. By the third time, it was dark outside so I was working by the light of my phone flashlight. I couldn't even get a vacuum to register on my micron gauge and in the light of the flashlight, there was smoke coming out of the filter cap when the pump was running that i had not noticed in bright sunlight. I double checked the oil level and it was fine. Eventually I realized the the pump had failed and purchased another from Harbor Freight Tools that weighs about 50% more than the one from Amazon. It performed phenomenally and I was able to vacuum my system down to 170 microns with 2 sessions. I returned the failed pump to Amazon and saw that other users had had the same experience as I.

Works great, did a 1 hour pump down no problem, not too noisy and didn't get too hot.

Excelente bomba

Works perfect for the DIY installs

Me encanto el tamaño, el precio y ha sus 5 trabajos realizando vacio a equipos en r22 y r410a revisando con vacuometro realiza lo que promete.

لا انصح في شراء هذا المنتج لعدم توافق الجهد الكهربائي في بعض الدول ولايوجد توضيح كامل بخصوص الجهد الكهربائي. و صعوبة التواصل مع التاجر لارجاع المنتج منذ شهرين. ولا يوجد أي تواصل واهتمام. لا انصح بة.

Funciona bien y el empaque es muy bueno, incluye instructivo bien explicado y aceite en una botella que viene en la misma caja.