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Thought I’d circle back to this with an update. Finally had a nice day and, like everybody else, I seem to have some time on my hands.... so I did some more diagnostic work. There is a leak but it’s inside the wall where I can’t reach it. The PEX line comes across the coach through the basement then goes up inside the wall to the air gap device under the bathroom sink before coming back down to the actual flusher on the black tank. I might be able to fish new lines up to the bathroom but it would be easier to abandon it and start over. I could put the air gap device behind the fridge or in the compartment with the furnace. BUT I have noticed that after market flush valves do not use the air gap at all, relying instead on the back flow valve at the tank. It would be a lot simpler to just run a single line from the hook up directly to the tank flusher. Any thoughts on that idea?
Thanks
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