Removing Atwood water heater plug photo added

enblethen wrote:
ckwjl, I would install a plastic fitting in the tank and then use the brass check valve.
10forty2, that is unnecessary as the iron gas line is grounded to the chassis through the mounting brackets.

Could be unnecessary as you say, but that's how mine is done also...except they used a white bonding wire instead of a black wire on my coach. White is the standard color for bonding wire in residential wiring. When I questioned the same thing in my mind as the pipe already being grounded, I decided to trace the white wire and sure enough it was bonding the section of pipe inside the water heater compartment to itself on the section of pipe under the coach and then to the chassis through the pipe mounts. It's actually a fairly common practice since the flow of LP through the pipe can cause static buildup just like the flow of gasoline through a fill nozzle can cause static buildup. It just ensures a solid bond to eliminate static. That's why they always recommend that you don't take your hand off the fuel filler nozzle while fueling...so you don't cause the static to discharge. In keeping in contact with the nozzle, you are bonded to the nozzle and can't cause a potential difference for an electrical charge and hence an avenue for a spark to jump across. :-)