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Old 09-17-2012, 10:05 PM   #21
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That pipe moves up and down as the tank fills or empties, remember it is attached to a plastic tank and the top of the tank moves up or down.
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Old 09-17-2012, 10:17 PM   #22
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That pipe moves up and down as the tank fills or empties, remember it is attached to a plastic tank and the top of the tank moves up or down.
Thats correct, that white fitting is actually a sealed expansion joint. The pipe can't move very far however, it would have popped his top cap! Besides the tank will crack if it moves very far repeatably.
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Old 09-17-2012, 10:36 PM   #23
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That's how I learned this I had a Sunnybrook and the cap popped of, the pipe was about half an inch too long.
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Old 09-17-2012, 11:12 PM   #24
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Ok, help me understand.

The black pipe actually moves up/down?
Is it attached to the tank itself?
And why would the tank move up/down as it fills/empties?
Is it not strapped down to the frame?
If I cut off too much pipe, what would happen?
?????
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Old 09-18-2012, 08:22 AM   #25
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The tank has a large surface area and it's plastic, the pipe is attached to the top of the tank and as we all know plastic is pliable so the pipe moves.
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Old 09-18-2012, 08:32 AM   #26
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The tank has a large surface area and it's plastic, the pipe is attached to the top of the tank and as we all know plastic is pliable so the pipe moves.
Mine is glued to the roof flange and the vent cap is screwed to the pipe. It may move, but only if the roof is flexing. The top of the pipe is flush with the bottom of the vent cap.
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Old 09-18-2012, 11:15 AM   #27
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My vent cap has one screw that holds it to the roof flange along with 3 push down snaps. Don't know, but I would think there would be some caulking under the roof flange that would also be around the pipe. The pipe cannot be turned by hand so I tend to believe it won't move up/down either. It is not secured at the top, so it must be at the tank.
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Old 09-18-2012, 12:39 PM   #28
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Maybe I missed it along the way - but what makes you think that your black tank isn't venting properly?
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Old 09-18-2012, 03:11 PM   #29
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Da stank! Done everything else.
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Old 09-18-2012, 03:17 PM   #30
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Even if my vent pipe was completely blocked, the only time any odors would get into the cabin of my trailer would be when the toilet gets flushed. And that would be for just a few seconds of having the flush valve open. Other than that, I don't see how you would get odors into the trailer.

Does your toilet hold water in or does it seep into the tank over time?
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