OCO was designed to displace the air left in a growler after its been opened. By injecting CO2 into a growler of beer you can purge the oxygen from the headspace of the growler, leaving a blanket of CO2 over the beer preserves its carbonation and ultimately its flavor profile. 
With the integrations of a pressure a relief valve and LED indicators preset to the optimal pressure setting the beer and growler are safe and ready for the next pour.
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