The Duotight In-Line regulator works with both gas and liquid. Easily adjust the flow can be adjusted with the yellow adjustment knob. 8 mm Duotight fittings at both inlet and outlet make this unit perfect for use with EVABarrier 8 mm OD tubing. Features an integrated pressure gauge so you can quickly and easily dial in your pressure setting. The gauge is removable and can be swapped out with a gauge of a different pressure range.