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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.)
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If it opens but not closing anymore you have a problem. This can happen with old valves.
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