W/D Hookup - which gray tank?

[Shellye]

Hi There,
I have a heartland Edge toy hauler with hookups in the back. It has two gray and two black tanks (two bathrooms). I am guessing the second gray water tank includes the back w/d hook up. How do I know for sure? I don't really want to rip the underbelly off to see... is this a common sense conclusion?
Shellye

 

[Garypowell]

I don’t know your model but a couple of ideas:

I can trace my lines from the basement. Taking down the wall is a good thing to do anyway.

secondly get some food dye and dump it down the washer drain pipe. Flush in a lot of water with a hose and then see which handle gives you the color.

 

[Shellye]

great idea! thank you!!!

 

[CDN]

Just put some stinky Pine Sol in the tank or drop some color dye and trace it out pulling the valve open.