Washer/Dryer hookups

Hi All,

I purchased a new to me 2007 5th wheel that has a washer and dryer in it. Apparently the model I purchased was prepped for it when new. I have 2 water lines with plugs in them that run to the bottom of the coach (Below where the washer/dryer are located). I assume that the plugs are to winterize the water lines for the W/D??

I have never messed with a W/D in a 5th wheel and am not sure just what these lines purpose is. All the plumbing is ran in the walls and not visible.

Any info would be appreciated,

Thanks,

Steve