New house, 1940s, natural gas fireplace insert. The pilot light makes a high pitch hiss.

Sometimes it doesn't, for moments, but mostly it does it all the time.

In this video I've turned the knob back past pilot and towards off, I can make it stop.

Is this dangerous?

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[–] 3 points 1 day ago

No. Not inherently.

It's worth doing a pressure or leak test on something you're uncertain of, but it's not likely to be an issue.

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