Why mess with the aggravation of CO2. Install a McDantim dual gas blender and balance system to 22PSIG? Push ale / lagers with the 60% CO2 / 40% N and the nitro beers with the 25% CO2 / 75% N. Also, be certain to return that air back to the keg cooler. Do not use 3/8" ID vinyl for your trunk line.
You probably require about 20 feet of line between the keg and shank. Use two feet of 3/16" attached to 18 feet of 5/16" trunk line to the keg. These two lines will carry about 10 oz. of beer.
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