I've been complaining about my Aquatek regulator for a while now, and seems like I've found the problem. In addition to the stupid O-ring (between the regulator and CO2 bottle) they overcharged me for (5 for $10!), there was another broken O-ring. This time, they don't sell a replacement, at least I can't find it anywhere. It's not on their website or their ebay store. Here it is:
I remember that I couldn't get it to stop leaking when I first got it. Not until I twisted the regulator body a bit. This is the O-ring that connects the CGA fitting to the regulator body.
I fixed it by buying some 1/4" ID by 3/32" faucet O-ring from the hardware store (not sure about the thickness but I know it's not the 1/16" one). It's not going to fit properly so stretch it out by pulling on it for some time. Install it and put pipe dope around the threads before screwing back in. Hope this helps anyone with a leaky Aquatek regulator.
FYI. Here are my theories for why this O-ring failed:
1. This fitting was already loose when I got it (leaking out of the box) so I might have over tightened it when I turned the regulator body.
2. I used the nylon washer that came with the CO2 tank on this regulator so the extra squish allowed me to over tighten the O-ring. DO NOT use the nylon washer that comes with your tank if you have this regulator!

I remember that I couldn't get it to stop leaking when I first got it. Not until I twisted the regulator body a bit. This is the O-ring that connects the CGA fitting to the regulator body.
I fixed it by buying some 1/4" ID by 3/32" faucet O-ring from the hardware store (not sure about the thickness but I know it's not the 1/16" one). It's not going to fit properly so stretch it out by pulling on it for some time. Install it and put pipe dope around the threads before screwing back in. Hope this helps anyone with a leaky Aquatek regulator.
FYI. Here are my theories for why this O-ring failed:
1. This fitting was already loose when I got it (leaking out of the box) so I might have over tightened it when I turned the regulator body.
2. I used the nylon washer that came with the CO2 tank on this regulator so the extra squish allowed me to over tighten the O-ring. DO NOT use the nylon washer that comes with your tank if you have this regulator!