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Old 04-13-2015, 02:12 PM   #1
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Black tank flush

I researched on the forum and asked around but couldn't seem to get a Yes/No answer to this practice - is the black tank vented? If yes, I should be able to add some water to the black tank directly from the black tank flush valve without leaving the black tank valve open, correct?
I'm confused by the sign next to the black tank flush valve (image below). I don't know what 'fullway termination valve' refers to.
So when I added water to the black tank, I had DW stepped on the toilet pedal to vent it. I hope this is not necessary.
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Old 04-13-2015, 02:15 PM   #2
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It is vented, "it has to be"
That's lawyer talk so someone doesn't forget to open the valve when flushing.
I fill mine partly all the time with the black tank flush then open black valve.

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Old 04-13-2015, 02:17 PM   #3
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I believe the warning sticker is talking about this thing:



That's to ensure you don't turn the water on, forget about it and come back to flooded camper.
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Old 04-13-2015, 04:43 PM   #4
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If you are ever on top of the RV you can see the vent.
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Old 04-13-2015, 05:10 PM   #5
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Quote:
Originally Posted by Iwritecode View Post
That's to ensure you don't turn the water on, forget about it and come back to flooded camper.

I find it way too easy to do this. I've already had a couple of really close calls...there is always so many other things that can be getting done while waiting. I am currently working on adding an alarm to the "RV Systems Monitor Panel". I plan to tie into the "full" indicator and run it through a switch so the alarm will only sound when turned on during black tank filling. Right now, I'm waiting on a beeper ordered from overseas (didn't want to spend too much at this experimental stage).
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Old 04-13-2015, 06:10 PM   #6
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Thanks to all the feedback. I guessed it correctly but just wanted to confirm so I don't make a stinky mistake. I'd never walk away during flush. I plan to add only ~5 gal water. Then go inside and add chemicals.
By the way, the earlier problem with grey tank valve is now fixed with a replacement. However, both grey and black valves are hard to open/close because, I think, the cables are really long.
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Old 04-13-2015, 10:00 PM   #7
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Everyone else has already answered (I was on vacation), but just to confirm...YES it is vented.

Also as others have stated, just because it is vented does not mean there aren't risks. When that vent hits the water surface it is effectively negated.

Our engineers don't love cable valves either...but it was the only way to get them to the of camp side with that floor plan. We've been running them on the 2250 for some time with no issue so I convinced them they would work here as well.
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Old 04-13-2015, 10:05 PM   #8
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Everyone else has already answered (I was on vacation), but just to confirm...YES it is vented.

Also as others have stated, just because it is vented does not mean there aren't risks. When that vent hits the water surface it is effectively negated.

Our engineers don't love cable valves either...but it was the only way to get them to the of camp side with that floor plan. We've been running them on the 2250 for some time with no issue so I convinced them they would work here as well.
Could they not add an elbow and use a solid rod instead of a cable? My Flagstaff has about a 3'+ long solid alum rod.
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Old 04-13-2015, 10:26 PM   #9
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They could if it was a straight shot, which I don't think it is.
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Old 04-14-2015, 12:23 PM   #10
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Originally Posted by bclemens View Post
Our engineers don't love cable valves either...but it was the only way to get them to the of camp side with that floor plan. We've been running them on the 2250 for some time with no issue so I convinced them they would work here as well.
I actually can think of another way. Run two smaller pipes directly from tanks to the dump side and join them there with valves, so to eliminate soft cables. The current design with long cables is prone to damage. Although my dealer denies this, I suspect they broke the valve, because the unit arrived winterized and was dewinterized by them. So they must have used the valve. The only reason they didn't tell me that is they broke it.
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