This Dual Primary CO2 Regulator Battery is ideal for dispensing two draft beers that require different CO2 pressures. This regulator battery can be used with any CO2 tank that has a male CGA-320 valve. Each outlet barb has a 3/8" O.D. to fit 5/16" I.D. gas hose. Built for durability, each regulator features a forged brass body with a chrome-plated finish, nickel-plated valve seats for high corrosion resistance, an integrated sintered bronze mesh inlet filter and a built-in CO2 resistant long-lasting nylon inlet seal. An easy-to-use dial knob allows for accurate pressure adjustment. Safety pressure relief valves release at 55-65 psi.