I'm new to owning my own welder so forgive the dumb question. I have an ESAB Rebel 215ic and plan to weld tig and mig, so two tanks 75/25 co2/ar and 100 Ar. I assume the tapered end goes permanently to the regulator gauge, and the hose from the machine goes to the other end, and the blue disconnect thing works like an air compressor disconnect? So I would buy two of these, one for each regulator and I only need the one hose that came with my machine since I only need one tank at a time. Is that correct?