A plated brass 0-5.0 l/min dial-a-flow regulator, giving enhanced functionality over traditional fixed flow units. 9 pre-set flow rates in a single compact design: 0.5, 0.75, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0 and 5.0 l/min. The pressure gauge shows the canister contents. For 34L, 58L and 110L canisters.