Portable Mini CO2 Regulator with Pressure Gauge for Homebrew Beer Kegging Draft system power and precision in a compact and portable package. Mini Regulators feature an adjustment knob and PSI dial for maintaining an exact pressure. This mini regulator will let you serve drinks on tap without any of the hassle of lugging around a tank or eating up the extra room in your home. Max Output 30 PSI. Accepts a  UNF threaded cartridge. Flared  MFL connection on the output. Required but NOT included: a CO2 cartridge and a ball lock or pin lock keg disconnect.