Yeah I found the tubing but didn't have the cap in it found one inside the camper. Wasn't sure if it belonged to it or if it had a valve you had to twist that's how my camper was set up. Thanks for the info very much appreciated.
Just to give you an idea of where the drain line comes out of the tank, here is a pic showing the end of the tank in my rig. The one that has the fitting on it yet is the drain. The open hole is the outlet line to the pump.
2008 Cruiser CF26RK
2013 Ford Eco-Boost
Heavy duty payload - Max tow