Now, crack the line open. This means turning on the regulator or the disconnect lever for just a second to release any leftover pressure. You’ll hear a short hiss—that’s normal. That’s the gas that was trapped in the hose. If you skip this, you’ll fight the pressure when you try to unscrew the old tank, and you’ll probably end up wrenching the threads. Nobody wants cross-threaded hardware. That’s how appliance marriages end in divorce.
Pro tip: do this in a well-ventilated area. CO2 is heavy and can pool in low spots. You don’t need to be dizzy because you were too lazy to open a window. (Hi, I’m the reason that warning exists.)
