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In my basement, the gas comes into the house via iron pipe, for example.
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Mine too...
Just as in your set up, when we had our old "octopus" gas furnace replaced,
I asked that a gas line be extended so we could eventually add a gas water heater.
They used black iron pipe, and terminated it with a shut-off valve.
The workmen told they always used "black iron" pipes for natural gas.