[shippos]

I purchased a few years ago the cmb-x1 beer faucet and I'm curious as to what the little knob on the side of it does. I haven't actually hooked the faucet up yet...still working on it...but after looking at i can't figure it out. It also has a gry plastic tapered insert into the shank and the inside of the shank is tapered as well...is this normal or does all of this allow for a creamy dense pour?

Thanks