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Old 06-26-2015, 10:47 AM   #1
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2003 25' Classic
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Bend , Oregon
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2003 Classic Black Water Flush question

We just bought a 2003 25' Classic. Love it. But not sure what the process is for using the black water flush? How much water should we use to flush? I tried a little bit but nothing drained from the tank and some water came out of the bottom of the trailer. I'd appreciate any advice on how to use this feature. Thanks!

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Old 06-26-2015, 11:11 AM   #2
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2008 25' Classic
Nixa , Missouri
Join Date: Nov 2012
Posts: 3,660
It sounds like the check valve that is inline in your black water flush line is broken. Same happened to me in my 2008 25fb Classic. I decided to replace it with elbow and plumbers tape on the thread. The valve is located behind the shower stall but you can get to it via the water pump access panel in the hall closet next to the shower. The PEX is flexible enough to bring the failed fitting into the area to work on. The Pex is a vertical pipe with the valve at the top and then makes a turn to another vertical pipe down to the tank. I purchased the gray elbow from the plumbing section of an RV parts store.

The check valve is a clear plastic valve. Probably water left in the valve and it froze during the winter. Previous owner of my trailer probably never blew out the line with air.

Once you get it fixed I run water into the black tank until its near the toilet. I set the monitor panel so it reads the black tank constantly and when the indicator shows 3/4 I turn off the water. I open the shades of the window across from the kitchen so I can see the progression. I'd verify visually until you verify the monitor panel is reading somewhat accurate.


2008 Classic 25fb "Silver Mistress"
2015 Ram 2500 6.7L Cummins. Crew Cab, 4x4, Silver
2010 Tundra 5.7L, Double Cab, 2wd, White
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Old 06-26-2015, 12:37 PM   #3
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2004 25' Classic
Prescott , Arizona
Join Date: Jul 2008
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I believe the 2003 is the same layout as ours. If so, the check valve Kelvin is talking about is under the bathroom sink counter in the back right corner. I removed ours also, but the flush still would not work. I have tried filling the black tank all the way up and letting it stay that way for 3 months with Ridex in it trying to dissolve any hardened particles, but still will not work. If yours ends up that way, I can show you how to install a permanent wand flusher that you can bring out from under the trap door in the bathroom to use and connect to a fitting that is in the outside refrigerator door.
Julia & Bob
W/ Deedee & Boo
AIR #30685
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