MASTERCOOL 90066-B Vacuum Pump

This thing sure sucks and allowed a vaccum to be pulled for my A/C system repair and charge. Work well.

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.

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.

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.

Nice light weight pump for the money. Pumps a system down pretty fast. The only thing I don’t like is the fact that this pump is made with cheap materials. You can’t throw it around like the more sturdy pumps. The metal cover over the motor fan is vey thin and damages easily as mine has done twice. It should be kept in a box in between uses or when being transported. I like the fact that it is light and pumps a system down quickly and didn’t cost a lot. Time will tell if it was a real bargain. It has performed well the 20 times I have used it.

This is the exact same item as the one another brand uses. Begins with snap, and ends in on. Save them dollars.

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??

It did a good job prepping my truck AC for recharging. Saved from the Texas heat!

Must have pumped down 50-60 mini split heat pumps with this ,not a problem with it , changed oil in it 3-4 times and it works great…..would buy again if it gave out.

Muy duradero

Used it to vacuum line on a mini split, did it in less time and all is good. It's more expensive than other one,but did the job in no time. I'm very pleased with it, I was very impressed with the purchase and shipping. I received it within 48 hours of order. Thanks

Bouchon qui ne visse pas. Mais pas de problème de retour. Le vendeur ne m'a pas demandé si j'en voulias une autre...

It is so nice and quite, but it doesn't pull a strong enough vacuum. Spent weeks troubleshooting my freeze dryer, including spending an extra $200 on a new vacuum sensor, only to realize that this doesn't even pull enough of a vacuum to register on the sensor... So yeah, don't buy this.