Duotight Flow Stopper - Automatic Keg Filling & Closed Transfer ToolThe Duotight Flow Stopper is a game changing tool for managing keg transfers without the mess. This device connects to the gas post of your destination keg and automatically shuts off the flow of beer once the keg is full, preventing overflows and beer waste. Featuring integrated 8mm Duotight push fit ports, it allows for a 100% tool free, oxygen free transfer from your fermenter to your keg. An essential for any brewer performing closed pressure