Put a tray under it and open and shut it real fast. If water comes out, it’s a water line. If you hear hissing and smell rotten eggs, it’s a gas line. ¯\_(ツ)_/¯
(Chances are you’re not gonna blow yourself up with a fraction of a second’s worth of gas leaking out, but for legal reasons this comment is a joke.)
Put a tray under it and open and shut it real fast. If water comes out, it’s a water line. If you hear hissing and smell rotten eggs, it’s a gas line. ¯\_(ツ)_/¯
(Chances are you’re not gonna blow yourself up with a fraction of a second’s worth of gas leaking out, but for legal reasons this comment is a joke.)
good luck if you break it
If it opens but not closing anymore you have a problem. This can happen with old valves.
If that happens, shut off the main and open the windows.
Well it’s capped off too, so first you’ll need to take that out.