This item is the same as our standard Fermtech Bottle Filler, but comes with a spring loaded tip. This unit can be taken apart and cleaned very easily. You can remove the spring as use the same as the standard Filler. You need one inch of space at the top of your bottle to get correct carbonation. This filler does it for you and fills the bottles from the bottom. Attach your filler to your siphon hose and place your filler all the way to the bottom of the bottle. Push down on the filler to fill, release to stop. Fill the bottle to the very top and pull it out and it leaves one inch of head space at the top.