Ask Kelly said the barb will screw off and allow you to attach a Duotight fitting. This allows you to only have to use 5 feet of line with a 4mm or 5mm ID tubing. The barb is kind of large so if you only have smaller evabarrier line or something similar this option would work if you have the fitting laying around.

Hi Tyson I have had this regulator for a while and have had no problems. In regards to your question and information provided; use a simple CO2 hose off the barb that exist and duo tight would connect. to the CO2 hose. I am curious what you are running the regulator too? This regulator screws directly to the CO2 tank and form the barb directly to a keg. I have only used duo connections on my pressurized fermentation. In that case the small CO2 tank with a regulator I come off the barb end with a piece of hose to the pressure fermenter and have a Duo connect blow tie spunding valve to regulate pressure in the vessel. I hope this helps. If you are looking a spunding valve I would recommend:SPUNDit 2.0 Spunding Valve Hands down better than the Blow tie. I hope this helps