ZENY 3.5CFM Single-Stage 5 Pa Rotary Vane Economy Vacuum Pump 3 CFM 1/4HP Air Conditioner Refrigerant HVAC Air Tool R410a 1/4" Flare Inlet Port, Blue

Every winemaker should get this vacuum pump. If you aren't familiar with Wine Degassing, you can read more online, but in a nutshell, "degassing" wine removes the CO2 that is created when sugar converts to alcohol. When you leave CO2 in wine, it tastes bubbly, and leaves a foul flavor. I've tried several other products to degas my wine before looking at an actual vacuum pump: * A handheld vacuum, often called Wine Pump or Vacu Vin. This is a six-inch tall pump with a rubber stopper designed for removing the air from a single bottle of wine. This works, but only pulls up small bubbles and takes a lot of effort to get a very small result. * A metal rod wine whip. This is a straight metal rod with two plastic flaps at the end that you attach to a power drill and stick into your wine bucket or carboy to spin the wine around and stir up the bubbles. This was essentially, for me, an electric version of the Vacu Vin. Not much of an improvement, and took a lot of time. * A Wine Whip degasser. This is a C-shaped plastic rod (much like the metal rod) that you also attach to a power drill and stick into your wine bucket or carboy to spin the wine around and stir up the bubbles. It works pretty well, better than the metal equivalent in my case, but takes a lot of time and only gets slightly larger bubbles than the Vacu Vin. * A Vacuum Sealer. This is a completely different product. These are used to vacuum seal food. There are a lot of examples online using a Vacuum Sealer that use the accessory port (normally used for things like sealing Mason Jars) to degas the wine. I haven't tried many of these, but my Vacuum Sealer had a safety mechanism that shut it off when it hit a certain amount of pressure, so I had to restart it over and over. In the end, it never got more than small bubbles. So I started looking for a proper Vacuum Pump; no shortcuts, just a real electric vacuum pump. If you've looked at these much, you probably know that they are pricy. Most of the local big-box stores didn't even carry them, and even the few that did started over $100. At the time that I purchased this unit, it was $48 plus about $10 shipping. I researched the different types of pumps: single stage, dual stage, etc. For Winemaking, a single stage looked like it was going to do the trick. The main advantage that I found in this research was that a dual stage would eventually be quieter as it was running. However, this vacuum pump isn't loud at all. I measured the decibels that it put out after warming up. With the decibel meter 6 inches away from the pump, it produced 64db. This is pretty low, in my opinion. This doesn't sound like an air compressor; it sounds more like a washing machine, dryer, but probably closer to a dehumidifier. This is not loud at all. The vacuum power on this is more than enough for a 23 liter (or 5-6 gallon) glass carboy. You are supposed to put another drip container in between your carboy and the vacuum pump when you start. I had read about how important it was to make sure that you don't get any wine or fluid into a vacuum pump, but having tried the above mentioned methods, I was expecting a slow start when I plugged it in, so I hurriedly skipped adding a drip container, but was ready to pull the hose off in case it started to fill the hose with wine. I am so glad I was ready. When I first turned it on, it degassed so fast! Bubbles shot to the top and wine was in the tube faster than I expected, and I was able to rip the hose away from the pump in time! But be careful, this thing can degas quickly. After that, I connected a drip container and turned it back on and it is pretty amazing how well this works. I was using spare hose, not air hose that is reinforced, so the hose and tubing collapsed on itself and pinched, slowing down the airflow. Tomorrow I'll be heading out to get proper air hose, a relief valve, and probably even a regulator so I can monitor the pressure. This thing works very well and is a great deal!

I needed a pump for a vacuum press that I purchased. Another, more expensive ( four times the cost of the Zeny ) pump was recommended for use with the vacuum press. As the saying goes "you get what you pay for", I was skeptical but bit the bullet and ordered it anyway. Upon receiving the pump, I noted that it was well packaged and even came complete with the pump oil (none of the other pumps that I looked at did). After having to track down a hose adapter (no fault of Zeny) I was able to put this little bad boy to work. Runs great and is pretty darn quite! I was expecting the noise level of a portable electric tire pump and was pleasantly surprised when I turned it on inside of my garage and it just hummed. Since I only need to run it for a few seconds every time (5-6 time per day), I think this little pump will last for quite a while. I will buy again if I ever have the need!

I've never done AC work and decided it's time to give it a try. The compressor finally failed on 2003 Expedition with 250K miles. I bought a replacement compressor, a gauge set and a vacuum pump from Amazon. All items arrived as-planned. The vacuum pump is needed after you install the new compressor. I connected the vacuum pump using the simple "push-on" connectors supplied as part of the pump onto the gauge set and connected the gauge fittings to the the refrigerate lines located under the hood. The high and low side fittings are different sizes so there is no way to connect the pump improperly. The pump has a simple toggle switch for on-off operation. It took a few minutes for the pump to pull a vacuum down to the recommended 30-psi. I turned off the gauge and the pump and waited approximately 4 hours to insure that the system did not have any leaks. The pump performed perfectly. Not sure what an expensive pump would do differently but for the limited us I'll need it for, it works great and at less than $60.00 (including shipping), I'm very pleased with the pumps performance.

I needed a vacuum pump for my home-made vacuum canister for resin casting. This pump was very affordable and (more important to me) was available for same-day shipping. I ordered it and it arrived the same day. At first I was worried as this looks like a cheap import but after powering it up, it draws my vacuum chamber down to 23 inches in about one minute. So far at least it works very well and is a lot quieter than I expected. there was one drawback though. It stated that it has a 3/8 and 1/4 inch port. The 3/8 port is standard, with a flare fitting and correct threads but the 1/4 inch port does not seem to have standard threads... maybe metric? Anyway, all I had to do was go to Home Depot and buy an adapter for the 3/8 port. No big deal but if you are planning on using the 1/4" port you probably should know that.

I'm making a vacuum bag & needed something in an inexpensive - this is it!! Works well / inexpensive / has an on off switch / comes with it's own oil / large window to see what your oil level is - draws all the air out of a 2' X 4' bag in about a minute and a half - have a small leak somewhere because air creeps back in after about 15 minutes so I'm thinkin' that's 'My Bad' … good product

Vacuum pump work great use it for A/C

The product is average, with satisfactory suction power, low noise, sufficient vacuum pump oil, and user-friendly operation. However, it does not have the functionality that my friends mentioned, which allows it to be used as both a vacuum pump and an air compressor.

Tried new oil, still no go. Cannot pull a sufficient vacuum. The more time allows, the more the pump gets hot and is less efficient. Buyer Beware. If you need to return this pump for any reason, you're looking at $30 shipping back to the company. Why would I need to return it? Well first off, they sent me a unit that has been used previously. I know this because there was oil on the unit, in the plastic bag, and soaked on the box, as well as oil showing up in the sight glass. There is no drain and no easy way to drain all of the oil, which is what happened here, and why oil is present. They did provide a new sealed oil bottle, but between the oil and how the extension cord was wound up, I can tell it was in fact used before. I wouldn't mind an open box buy so much, if came at a discounted price and worked. The next issue I faced was when I was pulling a vacuum for about 10 minutes, or less, I knocked the power cord loose and killed power. I quickly valved off everything, but the unit would not come back on. The unit was VERY hot, so I assumed that it had a thermal protection and why it would not come back on. I brought the unit inside to cool down for an hour or so and then decided to use my micron gauge on it as a test. The unit would not pull more then 900 microns on a 3 foot hose after running for 45 minutes or so in an air conditioned house. This is when I decided to return it. After UPS quoted me $31, I decided it wouldn't be worth it to return. So, I hooked it up again to my micron gauge for further testing and it pulled down to 550 microns fairly quickly, on just a hose. I'd say 10 minutes or so. I was pleased with that until it started rising, and rising, and rising up to 700 microns over 10 minutes or so before I shut it off. It is my belief that the oil is crap and the compressor is getting worked too much and not performing correctly. I ordered some quality oil and will test further when it arrives. Overall, i'd say buyer beware. Most of you probably won't be using a micron gauge or even know what that is, but i have tested the micron gauge on another pump to show that my gauge and hoses are not faulty or the problem. I know that this is not professional equipment and it has great reviews. Just keep in mind that they could also send you a "used" unit and charge you for the full price of brand new one, which is pretty messed up. The unit could arrive dead on arrival, but you're still gonna be on the hook for shipping since its not prime.

Works greats pulls a great vacuum and was a good price

Only used a few times but performed great. Not sure if it could be applied to commercial use.

Works well shipping was slow

Légère et compacte, parfait pour service résidentiel

Difficult to rate, because of my issue, but had I not had the issue I probably would have kept the unit and rated it higher. I was disappointed that this unit went off on overload twice, so I felt I couldn't trust it. Maybe I just had bad luck. It looked good, and well made. It did run and pull a vacuum, but I didn't have confidence that it would have a long life, or go off on overload and not re-set.