I have a 5 pound CO2 tank that I use to dispense beer from my Kegerator, but it is way to big and heavy to take to a party.
You can also use a 20 oz paintball CO2 tank, connected to a regular CO2 regulator. This is much more portable, but still bulky.
But I wanted an even smaller setup to use with my "Bagerator". It's a cooler bag I use to take beer to parties in 2 liter PET bottles. You can see an Instructable on it here.
You can see how I use the 2 liter pop bottles for beer in this instructable.
After many hours of search, I found an affordable mini regulator.
The only challenge is to connect it to the Paintball tank. The regulator input has 3/8-24 thread, which is not a pipe thread. This means none of the pipe fittings at the hardware store will fit. So I made my own fitting by soldering a brake line adaptor to a close nipple.
Step 1: Source Parts
Sourcing the parts is the hardest part!
You need to source:
Mini Co2 regulator - If found the cheapest one on Aliexpress (ebay from Asia) for U$22 delivered. Click the link.
CO2 ASA Adapter Fill Station Remote On/Off. Search for this term on eBay. U$3
Brake line fitting with male 3/8-24 threads. I found it at the first auto parts store I visited. Rummaged through their brake line fittings until I found one with the right male thread. I couldn't find one with female 1/8 NPT thread, so I picked one that was slightly larger and soldered a 1/8 NPT close nipple into it.
1/8 NPT Close nipple. Easy to find at any hardware store.
1/8 NPT to 1/4 OD "Push-to-connect". At the same hardware store
Step 2: Adaptor to Connect Mini Regulator to Paintball Tank
Because I couldn't find a fitting to connect the 3/8-24 threaded mini regulator to the 1/8 NPT thread on the ASA on the tank, I had to make one.
This is a very simple soldering operation, if you found a brake line adaptor into which the 1/8 nipple fits loosely.
Put some flux on the nipple threads, insert into brake line adaptor, heat with propane torch and apply solder. Took all of 3 minutes!
Step 3: Replace Output With "Push-to-connect" Fitting
I replaced the output fitting that came with the regulator with a 1/4 outer diameter push to connect fitting, Just push your 1/4 OD vinyl tubing that leads to your PET-a-draft in and you are ready to go!
Step 4: Assemble
Use teflon tape on the 1/8 NPT threads.None needed on the 3/8-24 or the paintball tank.
Screw your self made adaptor into the mini regulator and the other side into the ASA, which goes onto the paintball tank.
Test for leaks by immersing in water.