Here is the Gas Line held on to the "Hose Barb" quick disconnect fitting I used. There are many different hose barbs available for your co2 line. You could in theory use a 1/4" to Hose Barb fitting and do away with one bushing completely. This is just what I had on hand or could find locally and easily. Whatever size you use here is not critical so long as it does not leak.
