Bottle filler

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A bottle filler is a device or mechanism for automating or facilitating the process of transferring beer to bottles. In home brewing, a bottle filler is generally a tube of hard plastic or glass with a plunger on the end. The top of the bottle filler is attached to a flexible tube that delivers the beer from a bottling bucket spigot or a syphon from a fermenter. Pushing the bottom of a bottle against the plunger allows beer to flow into the bottle. Filling the bottle from the bottom limits the exposure of beer to air. A rule of thumb is to fill the bottle to the very top. When the bottle is lowered from the filler the flow of beer is stopped. Removing the filler from the bottle then leaves an appropriate amount of headspace for the beer. (QUESTION: Is this appropriate for all bottle sizes, including growlers?)