2 grey tanks

[kanderson]

we have 2014 XLR toy hauler. The panel says we have two gray tanks however when we drain the rear grey tank it contains black products. what should be connected to the two great thanks and the black tank.

[SuicideSaints]

The gray tanks consist of sink drains and shower drains. The black tank is the toilet.

Are you actually dumping the black tank?

Are there 3 dump handles?

[donanddona]

My rear bathroom has a sink that drains into the black tank. The kitchen galley has it's own grey tank. The forward bathroom has one separate black tank for the toilet and one separate grey tanks for the sink and shower. Three separate hoses required on the outside.