here ya go! hope this helps.
Tap-a-Draft recommends N2O cartridges for wine, margaritas, and mixed drinks. Can I use these 16 gram N2O cartridges for a nitrogen pour with a stout, or would I need a beer gas with a CO2 N2O mix?http://www.amazon.com/NEW-16g-Double-Cream-Chargers/dp/B00AIMMEYU