If your beer is carbonated in a Unitank or Brite Tank, you can't simply open up the sample valve or you'll have a cup (or face) full of foam. The Pig Tail Proof  Coil must be used with the lever-style TC Sample Valve which is available separately.
 
This particular unit is a 10 turn coil with approximately 5 feet of linear stainless tubing. It will produce a controlled flow on carbonated beers with up to 15 PSI behind it.
 
 Sample Valve sold separetely