Use this Duotight In - Line regulator in a multiple line, multiple pressure system. It's great for homebrewers and small bar owners who want to serve different beverages at different pressures. The regulator has 8 mm Duotight fittings at the inlet and outlet, and comes with an integrated pressure gauge that measures from 0 - 60 PSI. You can adjust the flow easily with the yellow knob. Just remember not to go over the gauge's pressure limit.