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Old 07-25-2019, 05:25 PM   #1
Join Date: Jul 2015
Posts: 55
black & grey holding tank valves

hello . We have a 2016 Shasta 25rs. we went to dump the black & gray tanks and could not determine which valve dumped the 2 tanks. Guess the valve closest to the tires snd the valve closest to the back would be a good way for anyone to tell us. Both valves are black. thanks

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Old 07-25-2019, 05:28 PM   #2
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the handles may be black but they should be two separate tanks. black tank is going to have a larger diameter pipe.

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Old 07-25-2019, 05:39 PM   #3
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Based on the layout:

And the fact that you have 36g black and 72g gray tells me that you have 2 gray tanks and 1 black tank.

Based on layout, I'm willing to guess that you have 2 sewer connections on the outside of the camper.

In my opinion, if there's dirty water in the tanks- put on a clear elbow, hook up sewer, and start pulling handles. Gray vs. black becomes apparently real quick.
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Checkout my site for RVing tips, tricks, and info | My family and I have fulltimed since June 2015
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Old 07-25-2019, 07:19 PM   #4
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ageed! a clear plastic elbow will tell you. and it will tell you other things once you know which is which.

if you can see the actual valves the gray tanks drain is 1 1/2" and the black tank drain is 3".
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Old 07-25-2019, 08:00 PM   #5
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thanks for the replies everybody. Yes the valves are not color coded (black valve for black tank & gray valve for gray water is not the case here) so i pulled the valve in the left ( closest to the tires) of the discharge tube and it was the gray water that discharged. There is another valve for the galley gray water to the right and under the water heater with its own discharge tube. I called and the lady confirmed that left valve was for gray water and right was for black water. thanks again
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black, tank, valve

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