This 8mm Duotight compatible regulator with 0-60 PSI gauge fits 8mm outer diameter tubing, and can handle pressures up to 150 PSI (if you buy an optional 150 PSI gauge). Suitable for gas or water, all components are food grade. The included gauge is accurate to plus or minus 4 PSI.
This is perfect for reducing the pressure of one gas line in a draft system - for example, with a single regulator and C02 bottle, you can set the pressure at the C02 bottle with the larger regulator (not included) and then put this regulator inline to reduce the pressure. Handy for when you want to carbonate one keg at 25 PSI and dispense another at 8 PSI.