Replace flex gas line connectors?

I am looking for a source that requires replacing a gas line connector when an appliance is replaced (for example a water heater). Some manufacturers state “do not reuse” on the tag. Does anyone have a reference to a standard or code that says gas line connectors must be replaced when the appliance is replaced?


Here it is on page 2

Hot dang your good. Thanks.

2006 IRC says:

Thanks Bruce, I didn’t know that was required.

Nor have I ever seen it replaced that I can remember.

On another note, I write this condition up on gas connectors about 1/2 the time.

We also recommend replacement of any Brass Flex lines as they have been recalled.