Using a Keg as a CO2 Source for Portable Serving!
This technique uses an economical inline secondary regulator to utilize a spare keg (or growler)as a CO2 source to serve a keg. I’m not suggesting this setup as a replacement for your kegerator CO2 tank. You still need a standard CO2 tank. What this setup could be very useful for is as a replacement for those expensive little regulators or injectors and expensive (considering how much CO2 you get) little CO2 cartridges. One inexpensive purchase allows you to pressurize and serve your keg on the go for little to nothing.
Side Note: I’ve wanted to do this for years. There used to be a commercial sanke keg that had two chambers. One was used as a pressure chamber and the other held beer. I always wanted one of those. The problem was that it was extremely expensive and I just couldn’t justify the expense. This magic little secondary regulator makes something similar easily possible.
The Hardware That Makes This Possible…
Kegland’s economical inline secondary regulators! As of this update there are three versions
- Kegland DuoTight Compatible Inline Secondary CO2 Regulator with Gauge – via MoreBeer – via William’s Brewing
- Duotight In-Line Regulator D1046 – DuoTight Compatible, No Gauge
- In-Line Secondary CO2 Regulator D1045 – This is the original inline secondary. Not DuoTight compatible, no gauge
Primary intended Use… Multi-Pressure Serving
Maintaining multiple CO2 pressures in your kegerator gives you the ability to… keep kegs at different pressures. This is a requirement to maintain different carbonation levels. It’s also handy if you want to force carbonate a keg more quickly, at a higher pressure, while maintaining your standard serving pressure on a keg that’s already being served or if you want to have a utility line for purging kegs and such.
… Line cleaning setup of convert compatible PET bottles to mini ball lock kegs – See: 
BowTie v1 Assembly
BlowTie v1 assembly that has been updated to digital, see below for walk through of that process.
The BlowTie is the heart of this build. It has DuoTight Push to Connect connections on both side as well as an adjustment knob to set pressure. Related: 
