Fill your growlers, jug or bottles cleanly and quickly from your Perlick 630SS (and the 650SS Flow Control) 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. We recommend using Keg Lube or Petro Gel on the o-rings.