Perlick 525 Growler filler. Fill your growlers, jug or bottles cleanly and quickly from your Perlick 525 tap. Double o-ring design insures a clean and secure fit. Fills from the bottom to reduce foam and CO2 loss. We recommend using a small amount of Keg Lube to more easily insert and detach fitting. This product is not compatible with the new Perlick 630SS faucet.