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Old 10-12-2014, 07:28 PM   #15
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Also, you should be able to see the pipes leading the dump valves on that model ... the 2" pipe goes to the grey water holding tank ...the 3" pipe goes to the black water holding tank.

By the way, knowing that that flush inlet is a weak point in the system, if the flush hose set up makes it doable, I often use a water pressure-reducer on the hose to help prevent excess pressure blowing it out.
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Old 10-12-2014, 09:42 PM   #16
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With the new setup, all of the pvc pipes going and coming from the valves is concealed by a sheetmetal cover with pullrods coming out of the valves. The only way to see whats what, is to get down and try to see throught the oversize holes the pullrods go through. Also, there is a pipe from the valves about 1 ft. long the hose attaches to. Problem is you close the valves and remove the hose there seems to be "residue" because there isn't enough slope in the pipe. I realize the pipe can't drag the ground, but sometimes simpler is better. Most times.
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Old 10-12-2014, 10:00 PM   #17
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I meant to ask earlier......where exactly does the water come out of the belly pan? As you said both black and grey tanks and their piping is covered with the sheet mtl. I would think if the black flush sprayer was leaking at the tank connection the water would end up in the sheet mtl box??


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Old 10-12-2014, 10:55 PM   #18
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Had this issue on my preowned 2008 Classic 25fb. The first time I used the black tank flush water came out of the bottom from beneath the shower location. My black tank back flow prevent valve was behind the shower not supported by any brackets. I doubt the previous owner even used it since the trailer looked hardly used. I suspect the movement of the trailer caused the valve to bounce between the shower wall and the shell. The valve is hard clear brittle plastic. I replaced the valve with a grey RV pipe elbow that had matching treads from an RV parts store. I used plumbers tape on the threads. It's been trouble free since. There is only one supplier for this valve. I think a metal valve would be too heavy unless your flush lines have support brackets.

http://www.airforums.com/forums/f444...ml#post1288964

I use the black flush all the time. The sensor can get confused if too much junk builds up in the tank. When I go to a campground with just water and electricity I fill the black tank almost full before I head to the dump station. I often put detergent in the black tank so it sloshes around and makes the tank wall slick. I used the black flush to calibrate the tank a couple of weeks ago.

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Old 10-12-2014, 11:14 PM   #19
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The water was coming out of the sheet metal box. I haven't crawled all the way under the trailer yet, but I would think there is a drain hole in the sheet metal for that purpose. I see you have a 2014 international also. Yours different from what I am describing? Just curious
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Old 10-13-2014, 11:37 AM   #20
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We have a winner. Mr. Landrum was correct. The valve was broken. Hooked the hose up to it and turned it on low. Had a gusher. Sad part is, after looking around, someone with dirty hands had been there before. Panel had been removed. So someone at Airstream knew and passed it along to the dealer, or the dealer passed it along to me. Either way, I will fix it. Thanks for all of the help. Mike
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Old 10-13-2014, 02:49 PM   #21
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by 'valve' do you mean the vacuum break?
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Old 10-13-2014, 03:11 PM   #22
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Get one of these Flush King - Valterra FK-01 - Sewer Flushing - Camping World. It lets you back flush the black tank with gray water and/or hose connection. Plus lets you add more water to the black tank for your next stop. More efficient than the AS flush connection.
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Old 10-13-2014, 04:08 PM   #23
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Sorry, vacuum break.
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Old 10-13-2014, 05:31 PM   #24
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What do I win??? Just kidding. I know what I won!

I was already planning on removing that vacuum breaker on our AS. I'm just waiting until I winterize in a few weeks since I have to open things up anyway to install the winterizing kit on the pump.


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Old 10-13-2014, 05:39 PM   #25
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I don't believe the sheet mtl cover on my tanks has any drain holes in the bottom. I wondered what would happen if water got in there?? I even thought of putting tape over the openings for the valve handles so road spray wouldn't enter the box. Water could drain out the openings to the valve handles, but those are a couple of inches up from the bottom. Unless there are seams on the corners that could weep/leak the sheet metal box could hold several gallons of water.


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Old 10-13-2014, 05:42 PM   #26
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Does anyone have a recommendation for a metal (brass) replacement for the vacuum break valve for the black tank flush that can be used to replace the POS plastic one from Airstream?
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Old 10-13-2014, 06:32 PM   #27
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I wonder if this would work??

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Old 10-13-2014, 06:40 PM   #28
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Quote:
Originally Posted by Landrum View Post
I wonder if this would work??

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Very good Landrum. I will look for this at our nearest plumbing supply store in the next couple of days and install preemptively.

Thanks!
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