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Originally Posted by daveinaz
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From what I'm reading, the solution is to just take out the valve and just replace it with two elbows since the anti-siphon valve really isn't needed because the odds of it back flowing are really slim? Is the anti-siphon valve supposed to prevent the black tank contents from coming back into the water supply hose that you've hooked up to the exterior flush fitting?
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The chance of getting black tank contents back in the fresh water is very unlikely. But it s possible.
If you have ever had the water company shut off water to your neighborhood, you most likely ended up with lots of air in your house water lines. That’s because the water running out of the lowest points in the supply lines pulled a vacuum on the pipes sucking all the water out of all the lines. If you had removed that valve, and if you connected the flush line, opened the water valve not knowing water had been shutoff, that resulting vacuum would pull anything in that flush line back toward the supply line. And that would be your water faucet where you, and everyone else, are getting your fresh water. That’s why lawn sprinkler systems are required to have anti siphon valves.