gray water tank

What kind of camper? If you want help, more information is needed? Make, model, year, what kind of camper (trailer, 5th wheel, truck camper, motor home?)

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You may be able to get under the camper and see the tanks. If so, follow the drains and see where they go.

Like Dutchmen said, we need more info.

More information would be a big help but it's been about 50 years since I've seen any 'single tank' RVs of any kind so unless you have a really old one, one tank is not likely. You MAY have one that has an internal valve that still dumps out the one OPENING under your RV however but the valve could be inside or outside but would have to be separate.

On most campers there is but one outlet, NOW on SOME campers there are 3 dump vavles.. Black, Gray, and "Main"

Follow the pipe back, if it comes first to a valve, that is a "Main" More on this later,, continue to follow it back, sooner or later it should split into two lines, one big, one small, the big one is the black tank it too should have a valve, the small one is the gray, and another vavle there too

To use.. Hook up and open main valve.

Dump black tank (open valve)

Dump gray (open valve)

Close all valves

To rinse black tank using contents of gray

Open main valve,

Dump black tank

CLOSE MAIN VALVE

Open gray valve

Count to 10

Close gray and open black and main

Do this again

Then open gray and main to finish dumping gray

And close all valves when done.

I have a1990 dodge xplorer class B & I can't find the gray water tank nor its drain valve

I have a1990 dodge xplorer class B & I can't find the gray water tank nor its drain valve I also can't find the fresh water drains. I am not new to campers as I have had more than 8 of them from popups to class a and now a class B xporer . I am 84 years old and I had a hard time finding the propane in let .its under the rear side door under the running board. I don't believe I will be able to reach it. Sorry to take up so much of your time but I thank you for your input.

They still make trailers where the grey dumps into the black, ie one tank.

If your tanks are empty you could try flushing the toilet and see if it comes out the one drain, then turn on the shower and see where it comes out. If everything comes out the same drain, well...

It's been awhile since I worked on a Dodge Xplorer Class B of that vintage, but I seem to recall that they only had a single waste tank. I don't recall at all where a fresh tank drain might be.