Mastercool 6 CFM Single Stage Vacuum Pump 90066-B

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

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.

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.

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

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.

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.

Buyers beware.. i purchased this as I am an hvac technician.. after the one year warranty expired in February. 4 months later it stopped working.. I contacted the seller who stated to contact mastercool. When speaking to their service manager, not only did the man have no knowledge of his products but decided to list of reasons as to why i might “think” it’s not working as though I am incompetent. So just know that if you plan to buy a mastercool pump, it will only last a year. Preferably right after the warranty ends and they refuse to exchange or refund for any reason.

It really is a solid pump.I love how it performs.The price is reasonable and since i am not a HVAC professional and not use this pump for daily i know that this will last a long time for my AC installations.

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

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.

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