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Old 09-20-2017, 11:17 AM   #1
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Leaking black tank flusher

2010 Kz spree 5er


Last trip when I flushed the tank water was running out of light fixture in basement. That flush hose comes into the basement and then goes up through floor. Puzzles me because I don't see where it goes back down. Doesn't it have to go down at some point to get to the tank underneath? There's a valve under sink above it but I always thought that was an air leak check valve for city water connection. Any thoughts on how that line for the flusher is plumbed?
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Old 09-20-2017, 11:28 AM   #2
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That's a vacuum break in the line to the tank , to prevent bacteria from the tank from coming back to the hose hook up.
The plastic ones are prone to leaking and there are brass versions available.
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Old 09-20-2017, 11:53 AM   #3
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Thanks.....I'll look at that valve this afternoon. I don't really think that's where it's leaking just because of where the water was dripping but worth a look and if it is it's a very easy fix so fingers crossed haha
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Old 09-20-2017, 01:38 PM   #4
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Thanks again....that was it. Local place didn't have any brass valves so I had to use a plastic one. I'll order a brass one to throw on there at some point. The plastic one lasted 7 years so I have a little time to get it done.
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Old 09-21-2017, 08:11 AM   #5
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Should have been located at a high point in the water system--usually behind the shower wall?
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Old 09-21-2017, 10:06 AM   #6
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Should have been located at a high point in the water system--usually behind the shower wall?
The vacuum break is only in the black tank flush plumbing, and just has to be higher than the , highest possible level of water ( and other stuff ) in the toilet bowl to do it's job.
Most that I've seen are under the vanity sink.
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Old 09-24-2017, 12:12 PM   #7
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I don't recall ever seeing any unit with anything in the kitchen connected in any way to the black tank, vent/vacuum break or anything else. My black tank flushers have always had a separate feed line that goes only to the tank and has a vacuum break in it higher than any water point in the trailer. Maybe I'm wrong, but just doesn't make any sense to me to have ANY way to have a connection between the black tank and the rest of the plumbing system, except for the flush line...
If you are talking about the highest level of water in a trailer, wouldn't it be the shower controls, which in most fivers is higher than the sink vacuum break.
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Old 09-25-2017, 08:54 AM   #8
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It was on the dedicated flusher line under the vanity in my bathroom. I would think it would just need to be higher than the black tank and water connection for the flush system which mine is.
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Old 09-25-2017, 08:56 AM   #9
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While we're talking flushers.......are the wand flushers worth the hassle? Reason I ask is I have a 2nd grey tank for the kitchen and back bedroom sink. I'd love to be able to flush and clean that out every now and then. I would also use it on my main grey tank. It's not really a must have but have always wondered how well those work vs the pain it had to be to use them.
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Old 09-25-2017, 05:07 PM   #10
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While we're talking flushers.......are the wand flushers worth the hassle? Reason I ask is I have a 2nd grey tank for the kitchen and back bedroom sink. I'd love to be able to flush and clean that out every now and then. I would also use it on my main grey tank. It's not really a must have but have always wondered how well those work vs the pain it had to be to use them.
They won't go through the P traps . If your talking about the type I think you are.

Many members report success , using dish detergent (1/4 cup) washed into the tank with a gallon of hot water, and 1/4 tank of water , then a short drive before dumping , takes a while for the foam to clear , but helps with any smell.
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