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Gas lines in homes are most often done in flexible copper tubing. A fairly new product also being used that is easy to spot is the yellow flex pipe a "flexible, yellow polyethylene coated copper tubing that is continuously line-marked for clearer identification of liquefied petroleum and natural gas." It would come in various sizes- 3/8" to 3/4" or even more for industrial applications.

Black iron or galvanized pipe is also commonly used.

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Q: What does a natural gas supply line look like?
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