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I just recently have gotten back into aquariums and after inspecting my old CO2 regulator, I noticed my bubble counter was cracked for one thing. And nope, it dont hold water. I started messing around, turning knobs and the tanked vented some gas and whistled when I turned the knob on top the tank. It vented from the side of the regulator. Any tips on safely testing the regulator out? I can't find my intructions!