Depending on the location of David's toilet, he may have an electric operated toilet rather than a air/electric toilet. The air/electric toilets are typically only used when the toilet can't be located directly over the waste tank. Mine is over the tank so mine is not air assisted.
At some point, someone has removed the valves and connected plumbing on my coach and replaced them although they used the hard black sewer plumbing parts and glued them together so a redo will be a much bigger job than they way you did yours Wally.
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