This growler filler fits Perlick 600 series faucets only(630, 650, 680, 690).This DOES NOT FIT Perlick 525 Faucets or any other faucets.Allows you to fill from the bottom of the bottle to reduce foaming.Tip** turn down co2 pressure and purge keg of excess pressure so beer flows very slow, this will almost completely eliminate foaming** Remember to turn your co2 pressure back up after filling to maintain proper carbonation in the keg.