RedRock Gallo Drain Gun- with 5 Unthreaded CO2 Cartridges for A/C Condensate Line - Air Conditioner Cleaner Blaster Opener Kit with Five Cartridge Clears HVAC Clogs

Perfect for my needs. Took two canisters to clear the clog in the ac condensate line. My piping arrangement is such that it’s hard to make a seal on the rubber stopper and so I took a piece of lawn sprinkler fittings to help me get some leverage and keep the seal while it did it its work. You can find something similar at Lowe’s or Home Depot. Definitely recommend but you’ll need something like this to help make the seal.

This thing worked when nothing else did! It's especially useful if you have pipes that are at too great an angle to allow for a good brush out - or snake out...or the clog is too far down the pipe. What worked for me: Make sure to get a solid seal and give at least 1 good blast from the bottom - and fully cover the top of the pip to catch anything that blows out. It should work in one blast (but you can try two). Once the clog is blown out, then disinfect the pipe with vinegar solution - and vacuum out from below and above. You'll be good to go!

I must add a warning review to those that have been left before -- which I wish I had heeded. I used up four CO2 cartridges and my condensate drain was still backing up and causing the A/C system to shut off before achieving the desired temperature. Screwing in the fifth one, something went wrong with the plastic threading on the tool itself. :( I went with a more expensive but surer solution here on Amazon -- a $90 monstrosity that looks like a fat bicycle pump with two hoses. Pulling up on the pump level creates a strong suction, depressing the lever expels the water (and goop) out the second hose. That will be my go-to solution moving forward. I have contacted customer service at Red Rock and will update this if they will accept a return of the tool or at least provide a partial refund (clearly it HAS worked for other people, but not for a notable minority) and will update my rating/review if this works out. Quality customer service can make up for a disappointing product.

I used this to clear my condensate line -- I used 4/5 cartridges before it finally cleared.... try going one way then if that doesn't work try the other end. I put shop vac on one side and this on the other and it finally blew a whole lot of god only knows what out the other end. I started at the top with the shop vac at the bottom 3 cartridges and nothing then I reversed it - shop vac on top and this airgun on bottom and it cleared in a few seconds saved me an expensive AC call. dont forget to plug anywhere else the air might come out, vents etc.

This did not work for me but would probably work for a minor clog. This AC condensation line was in such an awkward place and too small for a regular snake I ended up having to cut a section of pipe with the clog out altogether and replace it. This clog was thick and hard. So I don't think this gadget stood a chance.

I was nervous to use this since many reviews mentioned it did not work. I’m glad I did try this because it cleared my clog within minutes. I had a bad clog, so I used 3 of the CO2 canisters. It was easy to use and I’m glad I’ll have it on hand the next time the line backs up. It saved me a high priced AC tech visit!

It is difficult to penetrate the metal seal and when it is penetrated sometimes the o'ring seal does not fully seal.

Works well for their intended purpose