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Can I use 1/4 inch copper tubing with a compression needle valve to run propane to a gas light? I am worried that gas would leak from the compression fitting

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You'll need to look into your local code to find out if it's approved. Where I live, compression fittings aren't allowed for gas but flared fittings are. If you're not sure, you should contact a licensed gas fitter in your area.

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Sounds like you should hire a qualified gasfitter. A properly connected compression fitting will not leak, but there's no point in DIY-ing gas lines if you're not 100% sure of your ability to get a leak free connection. Your propane supplier will usually either have people on staff, or know who to recommend locally.

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