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Portable and simple.
Work well but an expensive alternative to using CO2 cannister.
Work very well for picnics and other parties. I would recommend these for portable keg dispensers.
I use these with my compact CO2 injector not only to pressurize my home brew kegs but to purge out the air from growlers before i fill them as well as between pours to minimize the beers contact with the harmful effects of the air on the beer. I have kept a gallon of beer fresh this way for over a week drinking a glass or two from it each day.