Our gas supplier (Nicor) specifically cautions against reusing old
BRASS flex lines. IIRC the problem is related to the corrugated hose
connection to the brass pipe fittings. The new flex lines are
stainless steel so they are likely much more robust than the old ones.
At any rate, why take chances for the few $$ involved?
You need to read this from a gas company and the US Consumer Product Safety
In general if it's an older uncoated brass fex line it must be replaced.
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