Not sure about the 2004 Montanas, but newer ones (2007 in my case) do have two grey water tanks, one for the shower/vanity and one for the kitchen (galley) plus the black water tank. The pull handle for the kitchen may be in front of the wheels, between the wheels, or behind the wheels depending on the Montana model. That water may come out the same outlet as the shower/vanity/black water drain pipe, or it may have a separate drain pipe at the rear of the trailer. My handle is just in front of the wheels and under the bedroom slide.