[YakDout]

Make sure they know what they are doing. Gas lines need to be fused properly to ensure they are gas tight under pressure. I do this for a living. Im a contractor for sdge to fuse/pipefit underground natural gas lines. Ton of money in it right now replacing all the old leaky stuff over the county to the newer yellow PE material. What size gas line? Steel? Poly? What is it running to?

You dont want a plumber, you need a fuser. If they start gluing your gas lines together you got the wrong guy for the job. Some plumbers do have fusing certifications. If you can give me some more info I might be able to help you out.