Hi from Edmonton, Alberta Canada, Recently purchased an older Starcraft Nova very clean inside and out and have been tinkering a bit checking things out. There is some water damage on the roof around the vent but from reading other posts i guess this is normal. One thing I am looking for help with is the hot water tank when i try to fill it the water just drains out. There are 2 grey tubes on the side 1 I am sure is to drain for high level and the other to drain. I can't seem to find a shutoff for the tube draining the tank???? Any help would be fantastic.