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Plumbers, hmmm.  Thoughts about backyard digs and double backflow valves in the sewer pipe.


That’s right, not one, but two. 


A neighborhood in Dallas not far from mine a dozen years back had literal toilet explosions when a city contractor pressurized the wrong set of pipes. We’re talking sewage that blows through the ceiling and into the attic.   Raw sewage.


Answer:  Two (count them) TWO backflow valves in the event one gets stuck open. 


“One” just ain’t lucky, R-man.


Can’t sue the city. Insurance didn’t cover for some folks.


I’d burn the sunuvabitch down before I moved back in to it. There’s no “fix” to remedy the extent of that problem.


Two.


If it’s in your backyard, it’s two.

Stack the deck on the astral plane.


.