

🚀 Suck it up like a pro — Mastercool’s vacuum pump means zero downtime!
The Mastercool 6 CFM Single Stage Vacuum Pump 90066-B delivers a robust 6 cubic feet per minute airflow and an ultimate vacuum of 80 microns, engineered with precision-machined aluminum components and upgraded seals to ensure maximum efficiency and durability. Designed for professional A/C service, it features easy oil level monitoring and maintenance ports, making it a reliable, long-lasting tool for demanding HVAC applications.









| ASIN | B01H5O66QA |
| Best Sellers Rank | #99,332 in Automotive ( See Top 100 in Automotive ) #35 in Air Conditioning Vacuum Pumps |
| Brand | Mastercool |
| Brand Name | Mastercool |
| Color | Silver |
| Customer Reviews | 4.2 out of 5 stars 285 Reviews |
| Flow Rate | 6 Cubic Feet Per Minute |
| Global Trade Identification Number | 00700376113594 |
| Included Components | VACUUM PUMP |
| Item Height | 7 inches |
| Item Type Name | 6 CFM VACUUM PUMP |
| Item Weight | 21 Pounds |
| Manufacturer | Mastercool |
| Manufacturer Warranty Description | MANUFACTURERS WARRANTY |
| Material | Aluminum |
| Material Type | Aluminum |
| Model Number | 90066-B |
| Power Source | Corded Electric |
| Product Style | 6 CFM, Single Stage |
| Style | 6 CFM, Single Stage |
| UPC | 700376113594 791511182889 |
| Voltage | 12 Volts |
P**Y
It does suck, vaccum wise...
This thing sure sucks and allowed a vaccum to be pulled for my A/C system repair and charge. Work well.
A**G
Great vacuum pump
I have been using these pumps for many years, they work great to get down to a deep vacuum. I use multiple of these vacuums with 1/2 vacuum hoses on one system. Pulls down to 500 microns before you know it. I use mine for a year and then retire them with a new one, and at the price point it is worth it. The pumps still work after a year and you can flip the apex seals in the pump to get longer life out of them.
J**Y
This is huge!
It works but this thing is huge and heavy. Wish I bought the little Robbin Air one. Inexpensive but massive in size. Probably better than harbor freight, maybe not.
D**O
Good vacuum!!
So far so good! It is working great!!!
N**E
Only worked a month, tons of oil vapor
I bought to replace my old one which Worked great for 10 years. This one, however, only worked for about a month before completely dying. It would also spewed WAY MORE oil vapor than my old one (I had the exact same brand and cfm, etc) Maybe the quality has decreased over the years??
I**U
Leaking oil container
I have not started using it but as soon as I opened the packaging everything was bathed in vacuum pump oil. Its a good brand just the packaging delivered a dirty product. I will update with performance reviews.
R**K
Worth every penny.
This is the exact same item as the one another brand uses. Begins with snap, and ends in on. Save them dollars.
B**2
Works for milking machine
We purchased this pump to run our milking machine for our cow. It is not heavy duty like the pumps my husband uses in his HVAC job, but the price tag was much, much less. It did the job we needed it to do. We only used it a few months before drying our cow off, but it will be put back to work soon after calving season. I will update this review if needed.
Trustpilot
1 month ago
2 months ago