The MoreBeer! Racking Arm and Sample Valve has been designed to eliminate beer contact with threaded fittings. The path the beer takes in and out of the racking arm and valve is very smooth, reducing the places that dried beer and yeast can hide and contaminate your beer. It also has a positioning arm that lets you know at what angle the racking arm is inside the conical. This design replaces the ball valve-style arms from our old conicals. The assembly attaches to the 1.5 inch Tri-Clamp coupler welded to the outside of our MoreBeer! Conicals. The racking arm has a 1/2" inner diameter.,,The Sample Valve seals at the front, and has a stopper and o-ring that separates the beer from the threaded fitting. As you unscrew the knob, you pull the stopper back and allow the beer to flow down the barb and into your sample glass or keg.