Orion Motor Tech Vacuum Pump, 4.5 cfm 1/3 hp HVAC Single Stage Vacuum Pump for R12 R22 R134a R410a R502, Auto AC Vacuum Pump Kit for Automotive Air Conditioner Resin Degassing & More, Oil Included

Work like a charm ! Did the job very impressed!

Great little pump! Quiet, does the job, convenient fittings, great price!

Unit works as it should. Essential if you are doing AC stuff by your own. Great vacuum pump. Hope it lasts.

Works as described but they barely provide enough oil to get just above the minimum requirement so be prepared to buy additional

Work well!!

I opened the box, added the oil that came with this OMT vacuum pump, connected a CPS vacuum gauge also recently bought from Amazon, directly to the vacuum pump, and started the vacuum pump to test its ability to pull a vacuum. After several minutes, I reached the astonishing low vacuum of 18 Microns! This is keeper!

I purchased the **Orion Motor Tech 3.5 CFM 1/4 HP Single Stage Vacuum Pump** expecting a reliable tool for my HVAC and auto AC needs, but this thing is an absolute **disaster**. From the moment I unboxed it, I could tell the build quality was subpar.### **Major Issues: **1. **Cheap Materials & Poor Build** – The housing feels like flimsy aluminum, and the components seem poorly assembled. Within minutes of running, the unit started vibrating excessively and making a loud rattling noise. The handle even felt loose.2. **Oil Leaks Everywhere** – After filling the pump with the included oil, I noticed **a major leak** around the sight glass and base. The seals seem non-existent, causing oil to drip constantly. I had to wipe the mess repeatedly, and after only a few uses, the oil was already contaminated.3. **Extremely Weak Suction** – This pump claims to be 3.5 CFM, but in reality, **it barely pulls a vacuum**. I tested it on an AC system, and after 30 minutes, it failed to reach the proper vacuum level. Compared to other pumps I’ve used, this one **underperforms drastically**.4. **Overheats Quickly** – After just 10 minutes of operation, the unit became **too hot to touch**. The cooling system is clearly inadequate, and I’m worried about long-term durability.5. **Unreliable & Short Lifespan** – After a **few uses, it completely stopped working**. The motor struggled to turn on, and eventually, it wouldn't start at all. Contacting support was a nightmare—**they ignored my emails** and offered no real solution.### **Final Verdict: **This is a **waste of money** and a **frustrating experience**. If you need a vacuum pump for serious work, **DO NOT buy this one**. Spend a little more on a trusted brand —you’ll save yourself time, frustration, and money in the long run.⭐ **Rating: 1/5 – Absolute Garbage. **

Performed perfectly. I purchased this for installing 2 split Ac units to put in my home to replace a central a/c unit that was failing. I needed this to vacuum the lines out as the lines on my units that were not pre-charged. It worked for me the first time on both units so not having to pay a technician to install the units saved me a ton of money. I believed I let it run about 25 or 30 minutes but that may have not been necessary. I just hooked it up and walked away for a while. It pays for itself after 1 use. I do about 90 percent of my projects without acontractor so I have to occasioally purchase specialty tools and this worked great.