Change how you drink beer—and keep it fresh longer. This clever device uses a CO2 cartridge to ensure that the beer in your growler remains nice and carbonated, so you can enjoy a growler for days. Typically beer in a growler starts to get stale and flat after about 12 hours, just like a bottle of soda. This cap maintains a constant pressure inside the growler without introducing oxygen. A pressure-release valve on the end of the hose lets you tap it and pour one glass at a time, keeping the beer...
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