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Old 05-11-2019, 10:23 AM   #1
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Check-valve on Black Tank?

Have used water valve (located in wet bay) to inject water into the blank tank. Now water pressure backs up at connector to black tank (in water bay) and sprays all over wet bay. If there is a check-valve (which I believe should be there) must have gone bad. Does not look like an easy fix, as wet bay would have to be entirely dismantled. Ideas??
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Old 05-11-2019, 10:57 AM   #2
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Quote:
Originally Posted by Long Island Mac View Post
Have used water valve (located in wet bay) to inject water into the blank tank. Now water pressure backs up at connector to black tank (in water bay) and sprays all over wet bay. If there is a check-valve (which I believe should be there) must have gone bad. Does not look like an easy fix, as wet bay would have to be entirely dismantled. Ideas??
I had the same issue on my old Seneca. There is a check valve on the black tank flush. They are usually located above the black tank, mine was under the bathroom sink. The replacement valve was like $12 and if you are a contortionist, you can replace it yourself.
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Old 05-11-2019, 11:20 AM   #3
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Could be that the small holes in the spray-nozzle inside the tank got clogged with ...'stuff'.
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Old 05-11-2019, 11:35 AM   #4
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Black tank flush system
Inlet connection, a anti-siphon vacuum breaker device (some have check valve) and a spray nozzle (piece of pipe with holes)


Anti-siphon vacuum breaker can fail......typically flood inside RV when they do
Nozzle gets plugged from minerals in supply water OR stuff in tank (level has to be really full)





Types of anti-siphon vacuum breakers


Cheap junk





Better ones






How to clear a clogged nozzle
Unclogging A Black Tank Flush – Our Camping Adventures
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