Hi. I'm new here and to the world of rving as well. Just bought a 2001 Fleetwood Wilderness 315G. I'm sanitizing the water system and can't for the life of me find the fresh waste drain. There's a metal plumbing pipe coming from underneath where the tank is (assuming location is under where the gravity fill is) with a cap on the end of it. It also has a female head where you can connect a hose to it but I can't find a valve anywhere. Help! Please!