One common black/gray dump handle.

[Morris & Rita]

Our 2011 3400RL has been replumbed at some point and the convenience center cables abandoned. There is one pull rod that you pull to empty the gray and black water at the same time. It’s located ODS in front of wheels by the drain hookup. One other pull rod is located beside the door step. I think this is second gray tank for washer. When we are sitting on a full hookup site we can only go 4 days between dumps. Read something about this last year when we bought the unit and I first started looking at this site but I can’t locate thread again. Any thoughts on how this unit was plumbed? Thanks

[DQDick]

That's a mod someone made. Most Montana's have a black and a grey tank handle in the convenience center and the one by the tires is for the kitchen gray tank.