Nitrogen/Co2 Draft Beer Regulator with Secondary Beer Regulator Jockey.... Condition is "Used". They system was used on Stout Beers Gunniuss, Coffee Stout and Milk Stout Beers kegs. Curretly set ar 30 PSI on secondary regulator and 100 PSI on main Nitrogen/Co2 Regulator. Both can be adjusted by turning center screw. Can also be used on wine draft systems with 100% nitrogen cylinder and lower PSI on secondary regulator.