Check the listing for details. Guinness Nitrogen U Keg Stout Conversion Adapter Kit for CO2 Regulator Kegerator. Condition: New. Listed at 120.99 USD. This partial conversion kit allows you to adapt your existing CO2 based system for serving rich, creamy nitrogen stouts!INCLUDES: CO2 regulator to nitrogen tank adapter (CGA320 to CGA580). Allows you to use any suitable CO2 regulator on a standard CGA580 nitrogen tank “U” Keg coupler (standard for Guinness, Harp and Kilkenny kegs. Stainless steel stout creamer faucet - Essential for getting the trademark light, lacy head of a cream stout. Also great for nitro coffee! Please Note: This is NOT a complete conversion kit. This kit only includes the necessary parts to convert your existing CO2 kegerator system to a nitro stout U system. Not all CO2 regulators are suitable to use with nitrogen. Be sure to check your regulator specifications to ensure proper and safe operation!