This is a great invention and has a wide range commercial application. I believe they have half the story. I hope this project gets funded, and the fact that it is open source code, I would love to work on a project like this to push application into commercial markets.
The Tapit Cap (Website) is $45 and has already reached it goal on kickstarter. Tapit goes over the opening of your growler. it turns into into a keg head which helps keep the beer fresher for longer. The picture on the bottom is of a Drink Tank Growler (website) which was also a kickstarter project, will be available for $65 and up. Ill be checking these out when they get a little further along.