The Stout Spout has a removable creamer/aerator disc inside, it is specially made to serve beers infused with nitrogen gas, and allows the nitrogen gas to flow smoothly through the faucet with the beer to create a smoother, creamier beer.
 
Simply un-screw the regular nozzle and screw on the Stout Spout and use as you would a stout tap.
 
*Tap, Shank, Handle, Nitrogen sold seperately