Description The Esab 0700017184 Acetylene 1.5 Bar Multi-Stage Regulator provides compact, two-stage performance in a single stage footprint. Two-stage regulators are recommended for applications that require a constant delivery pressure over a range of decreasing inlet pressures. The first stage reduces the input pressure to a pre-set intermediate pressure which becomes the input pressure to the second stage. Because the intermediate pressure is regulated, the delivery pressure of the regulator remains virtually constant. As a result, cylinders can be used to much lower pressures for increased gas savings –up to 10% of full cylinder content savings, depending on regulator service.