engineman writes:

I have a gas line running to my outdoor hot tub water heater. When I
first installed it 8 years ago I used black iron pipe because i heard
that it was required.
Lately I've noticed that it is heavily rusted where it is lying on the
concrete.
Can I replace it with galvanized?

Galvanized is usually Ixnayed because little bits may fall off and
clog the jets/regulator.

A strong secondary issue is plumbers who think galvanized == H2O..

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