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Old 12-27-2015, 04:03 PM   #11
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Originally Posted by Cooper092087 View Post
Ok so the left valve is the bathroom grey the middle valve is the black and the right valve is the kitchen grey. I have never just wanted to dump just the grey. I will have to relabel the valves. Thanks for the replies. I am sure I will have more as we are starting to travel long distance for vacation.
gray tanks have smaller diameter pvc pipes. easy to distinguish between black and gray tanks.

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Old 12-27-2015, 04:26 PM   #12
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Originally Posted by bikendan View Post
gray tanks have smaller diameter pvc pipes. easy to distinguish between black and gray tanks.
Maybe, if you can see them. Many tanks and their associated plumbing pipes are enclosed.

Mine are and all that is exposed is two 4 sewage port stubs located side by side. One port has the black and one of the grey tanks plumbed into it somewhere up under the enclosed underbelly. The other is the galley grey tank. You'd never be able to distinguish between my two by just looking at them.

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Old 12-27-2015, 08:54 PM   #13
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Coop, if your tanks weren't labelled correctly then, if you left the black tank valve open thinking it was the grey,, I would really flush the black tank a lot to get the hard stuff out. I hope it wasn't left open too long because the dreaded mound would possibly start to form for lack of liquid being in the tank.

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