If I were going to do that I’d make my own.
First get a tire inflater that uses the 16gram food grade Co2 cartriges, then you can use it for tires or anything else LOL
If using tire valve stems in a cap, that should work well, but wash them good and keep the liquid away from them, they are not food grade quality and who knows may even contain lead?
As long as the bottle is upright and the beverage does not contact the valve stem just blowing Co2 through should be fine, but I would not want to lay the bottle on it’s side and let it sit long term, know what I mean.
You should be able to squeeze a bottle and tell if it’s firm and hard, It says that device has a pressure gauge built in set for 55lbs, so you could use a tire gauge on a valve stem to see where your CO2 pressure is at easy enough. You might prefer 32psi or perhaps 65psi, they say the PET bottles are rated for 200PSI
I myself plan to use similar to the Tap a Draft system
http://www.northernbrewer.com/shop/tap- ... ystem.html
Although I think $70 is pretty expensive for that system, I have 4 of those kegs and taps free!
A friend drinks those mini Coors Light kegs and it looks like the exact same thing!
About $22 for the Mini keg of beer and when done with the beer you got the bottle and tap free for home brew!
Say with tax $25 for the mini keg of coors buy 3 for $75, drink the beer, then you got that system for same price but with 3 taps, not just 1 tap, and the beer was free! All depends how you look at things I guess. LOL
I don’t know how many 16gram cartriges it would take to force carbonate one of those mini-kegs yet, I hope only 1 and then 1 more to push out the beer as needed.
You can pretty well inflate a motorcycle tire with 1 16gram cartridge, enough to ride safely to get air though it’s not up to the full 40psi or higher with just one cartridge, so I guess 1 cartridge should carbonate the beer well as the mini-keg is smaller than a tire.