I have a 2006 Fleetwood Cheyenne. When crawling around underneath to remove the drain plug on my water storage tank I noticed a clear hose with a shut off valve and a male ribbed brass fitting. It is under the camper and the other end goes to my electric water pump. Basically two hoses go to my pump - one from the water storage tank and another that Seems to be set up to pump from somewhere else. Any ideas what this is for? Thanks!!