Is the Cessna Fuel Cap C156003-0101 vented?
Yes, this is a vented Cessna fuel cap.
Does this Cessna fuel cap (C156003-0101) include the chain?
No, this Cessna fuel cap does NOT include the chain.
Does the Cessna Fuel Cap C156003-0101 include the gasket and slip ring?
Yes, it will come with the gasket and slip ring.
I have these Cessna Fuel Caps (C156003-0101), I would like to replace the gasket on them, what is the part number for its replacement?
You can use P/N# 06-00987. This will work with the C156003-0101 fuel cap.