Since the Soda Fountain Pro product was designed for kids to use, there is a hand pump in the gun. In fact, this might be part of the fun for kids in using it. However, in field trials with adults and alcoholic beverages, the hand pump operation became a problem shortly after the fifth or sixth drink.



Plus, the goal is to have a bar gun - and the bartenders out at real bars don't have time to pump. So, it was clear that CO2 was the best option for driving the pump on a continous basis.



So, in order to hook up the gun to a CO2 system, you'll need the appropriate plumbing fittings to connect the small tube to the standard size CO2 air system.



I did this by purchasing a 1/4" hose barb to 1/4" female adapter and a 1/8" inch hose bard to 1/4" male plug. Cover the male fitting in teflon tape and screw it together.



Don't forget the teflon tape - it will ensure a good seal between the fittings and costs less than the CO2 gas you'd otherwise lose.



Cost for this whole lot at a respectable hardware store should run about $5-$6.