2008 Laredo 29RL Grey tanks

Thanks every one. I think the mystery valve has been explained

We had a 2007 29RL for years and it had 2 grey tanks and a black as Barney stated above. Each had a separate handle. Easy to test if you can hook up to water. Open one valve and turn on the kitchen sink and see if anything comes out. If not turn on the bathroom sink and you should get water out and you will know what handle goes to what tank.

My Laredo has two greys but it is an RK model. One grey tank for the kitchen and one grey tank for the bedroom area. Yours may be set up a little different but probably has two grey tanks also.

I suspect that one of the grey is for the kitchen sink. The other is for the bathroom sink and shower. The third is for the black tank. At least that is the way our travel trailer is set up.
Barney

Thank you I guess I will find out when we go out in Oct

Sounds like you have two grays, one for shower and one for galley.

There are three levers and three stickers I pull one of the grey and nothing happens I pull another one and it has water The black is also active

one grey one black. Are you just seeing stickers saying both are grey?