This economical plastic bottle filler uses gravity to shut off the liquid flow. Simply push the filler down on the bottom of the bottle until the beer or wine reaches the top, and after removing the filler, the perfect amount of headspace is created. Choose between 1/2" or 3/8". The 1/2" bottle filler uses 1/2" tubing and the 3/8" bottle filler uses 5/16" tubing.
Good product, depends on what I'm using it on, if I have a little bit of any particles left in beer in bottling bucket, this does seem to get plugged a little easier than the spring version and leaks slightly.