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Old 04-07-2010, 12:27 PM   #1
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Which Dump Valve is which?

Hi Y'all,
I am new to RVing ... I purchased a 2010 8528RLWS in Dec. and cannot tell which valve is for Black and which is Grey. Their is no specific label for each. One is recessed back a good bit and there is a label above that says Waste Water Dump Valve. It's all waste water to me so that doesn't tell me anything definite.
Can anyone help.... Is there some identifying factor that works for all RV's? Short of filling a tank and testing - How do I find out? The manual is no help. Yes, I asked the PDI tech and he was not sure.

Thanks in advance for any help
LJ
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Old 04-07-2010, 12:42 PM   #2
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Dump valves

If you can see piping from below easiest way would be:

3"-4" would be black water
1 1/2" would be grey water
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Old 04-07-2010, 05:24 PM   #3
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Take a close look at the handles. On mine, the grey water is a (dark) charcoal grey color and the black tank is black.
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Old 04-07-2010, 08:42 PM   #4
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If you can get down there and look....the larger of the two valves is the BLACK water.
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Old 04-08-2010, 07:31 AM   #5
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OK had the same issue on my 8526RLWS. Since the handles are unlabeled and identical, the one closest to the dump mast is BLACK water. It is also further out from the frame. The one to its left is the grey water and it is inset (less out). I wound up labeling mine but I used Dymo thermo labels. The sun makes them white again in short order. I had a hell of a time cleaning the label glue off the camper.
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Old 04-08-2010, 08:32 AM   #6
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Just fill one and pull, I had the same problem as I have one black and two grey. Once I figured it out took a piece of electrical tape (black) to mark that handle and a piece of duck tape (grey) to mark the other.
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Old 04-08-2010, 12:44 PM   #7
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You are lucky, you only have 2 handels. I have 3. Black, Gray bath and gray Kitchen. But to answer your question the largest is the black.
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Old 04-08-2010, 03:41 PM   #8
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Same as residential plumbing. Small drain line from sink or tub 1-1/2", larger drain line 3" from toilets.
We have 2 of each with our Bath and a half. One group mid coach is 1 toilet, bathroom sink and kitchen sink. Second group closer to the rear is 1 toilet, 2 vanity sinks and 1 shower. 4 valves total. I keep a spare for each size. I hope it never breaks with a full black tank and I bet no one around me does either.
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Old 04-09-2010, 07:03 AM   #9
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Using the pull one and see method is how I figured it out.

I put a clear 90 degree fitting on and looked at the discharge. Pulled gray water first to make sure there were no leaks. Then stopped the flow. Pulled black water to fully dump. Then pulled gray again to flush out the hose.
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Old 04-09-2010, 03:45 PM   #10
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On our trailer the one closest to the fitting is the black.
It has been that way on the last two trailers we have owned.
I don't know if that is a standard or not.

Bill
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