An 8 gram Nitrous Oxide charger bulb used instead of or as well as Co2 bulbs for Stouts to give an extremely creamy head. Works in exactly the same way as commercial widgets.
This Red Plastic Bulb Holder is for use with 8 grm Co2 Bulbs. Together with the Co2 bulb you can add additional carbon dioxide gas to your brew keg - add when required to keep up internal pressure and exclude air from the barrel