This bottle filler is made of durable plastic, and has a spring loaded ball valve at the tip. Simply push the filler down on the bottom of the bottle until the beer 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.
The 3/8" works really well for twelve to 22 ounce bottles but not so much for 1/2 gallon growlers. For them I use the 1/2" as it is much faster.
Spring-Loaded Bottle Filler