Duotight Bottle Filler Beer GunAlso available as a kit for better connectivity here Bottle filler beer gun made by the same people as Nukatap Faucets and the Robobrew Brewzilla brewing system. Line included is 5 16. Only beer line and beer disconnect included. An easy way to bottle beer or fill growlers avoiding the issues of oxidation. One trigger is used to purge O2 with CO2 and then the main trigger is used to fill the bottle growler with beer.