Q: A gas appliance fuel connector should NOT have an overall length exceeding _____ feet.
A: Answer is here
36" (3 feet) except for range and/or dryer connectors. . .
Easy answer if you know the rule about not interconnecting.
(But can you connect directly to CSST?)
Not in my town. . .
How about with a shutoff connected to both in between the two ?
My jurisdiction requires a rigid pipe connection to a shutoff - even if the rigid pipe is only 3" long.