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From BrewWiki
A '''Counter Pressure Filler''' is a device used to fill bottles from a pressurized source such as a keg without losing carbonation. Commercial brewers use these devices to bottle beer for retail sale. Homebrewers can also use simple counter-pressure fillers to bottle beer directly from a keg. Kegged, carbonated beer and a carbon dioxide (CO2) tank are needed to operate a counter pressure filler.