Rather than using Co2, which is common in traditional draft beer systems, the Guinness-style system uses a nitrogen / Co2 blend to push the beer through the lines.
This mixed gas comes in one cylinder that contains 75% nitrogen and 25% Co2. The nitrogen gives Guinness its creamy tight head.
Ken-Mar is an area dealer of Co2 G mix. Call 631-261-3506 to place your order.
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