The perfect solution for carbonating and serving at different pressures, the Duotight In-Line Regulator with Gauge allows you to down-regulate pressure from your main regulator to control pressures on different kegs! You can set the main regulator for the highest desired pressure in the system - for example, 14 PSI to carbonate one keg. You can then use this handy in-line regulator to down-regulator pressure to the next keg to 3 PSI for serving. This regulator features connections that accept 8 mm (5/16 in.) EVA barrier tubing on both ends. Regulate like a champ with this affordable Duotight in-line Regulator with Gauge!