Vern,
Your verbige sounds good to me to protect your buyer and you. Here in KY, the gas company is king - they can come into an existing home that met all gas, etc. codes when built (even fairly new ones -less than 10 years old) and after a meter upgrade, demand venting changes or they red tag/turn off gas! That happened to a client of mine, and I had to explain how the gas appliance was code approved in the past (inspection tag on water heater), codes changed later and she had to do what they said. Needless to say, she wasn't happy and somehow it was my fault! Oh well...