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Old 06-30-2021, 03:37 PM   #6
Stl-986
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Join Date: May 2017
Posts: 1,182
It's pretty easy to see if that seal is the issue. The top black union just unscrews.

smoke test wouldn't hurt either but might not show a leak there unless it's under pressure which is what the tank will be and why you are smelling the gas.
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