Add the perfect amount of restriction to any beer line to reduce foam. Eliminates the need for flow control in the faucet itself. Great for use in Jockey Boxes or anywhere you are serving beverages with varying levels of carbonation. If you are currently using a long length of tubing to increase restriction you can now shorten your tubing. A shorter line holds less beer. Beer that is stored in the line tends to warm up quicker, adding to foaming issues, and is more likely to stale from bacteria present in the line.