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probably the check valve in the tank that is supposed to slow down a fast release of gas in case someone opens the valve without anything hooked up. Mine does it on the left side because the regulator is on the right and when the tank has been off for a while it has to fill the pipe over to the regulator so it thinks it has a leak. I know, valves and regulators don't "think", but somebody tells all those gremlins how to mess up my day.lol
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