Agree with Doug's comment. Hope you're talking about a short length of hose
you can observe regularly. Long runs out-of-sight should be heavy gauge
copper.
Len




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Eliminate "ns" for email address.
"doug dotson" wrote in message
...
Pretty much any black rubber hose will eventually dry rot and start to
crack.
Takes a while though, especially if it is in not exposed to sun (UV).

Doug
s/v Callista

"Jessie" wrote in message
...
A friend says that standard black rubber propane hose gets old and
goes bad - needs to be replaced. Any truth in this ?