Installing a new tank in my 1992 Tournament but cannot figure out if the tank sits directly on top of the PVC drain pipe that runs the length of the compartment. There were 3 bulb type rubber seals that ran up and over pvc pipe and accross the compartment side to side. The anchoring system for this tank were 8 wood wedges around the outside of the tank that wedged the tank against the compartment wall. I cant figure if the tank was suspended above the pvc pipe or rested on it with simply the three seals isolating the tank from the pipe. Any help appreciated.