Perfect for small batches! This mini auto siphon is the right size for racking out of small 2 gallon fermentation buckets or 1 gallon glass jugs. The auto siphon is self-priming with just a few pumps, making starting the siphoning action a breeze! Works with 5/16" ID tubing.This is ideal for those doing 1 gallon batches of beer, wine, cider, mead...you name it!