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In certain states gas unions are not allowed inside buildings, so make sure you’re checking code. There are left and right hand couplings and nipples that take the place of unions. No sealant is required on unions faces – the seal is made by the beveled male/female surfaces. Also do not use regular PTFE tape. There is a separate type of tape for gas. Really, I think TU555 is the best sealant.

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