BLACK/GRAY TANK VALVES

[kdeiss]

Larry, no harm lubing the pull rod I am thinking it is the valve. Their is a plastic disc that moves between two rubber seals when you pull the the handle.
Thetford sells a valve lube that you put in the tank this will also coat the tank and help stop debris from sticking to the tank walls this is a good product I have used for years.
I am thinking a vegtable type cooking oil would work also
Ken