A single stroke action draws the liquid without disturbing sediment. It requires just a couple inches of liquid and works perfectly in carboys and buckets. This auto-siphon uses a solid, glue-bonded construction for simple sanitizing and use, and will not restrict the flow. It uses 1/2" tubing. The larger diameter of this auto-siphon allows for a much faster transfer of liquid, especially from fermenter to fermenter. Care is required if using a 1/2" set up for filling bottles because the extra speed makes the bottles fill very rapidly