On my Mac 19 the "front" vent was under the cabin hatch. I added some PVC pipe with a valve to open it when filling. On my 26M the front vent is under the V berth so even if nothing is on the cushions, it takes 2 people to fill/empty the tank. Has anyone ever run a pipe or hose line from the front vent to the cockpit to make it easier to empty, fill the tank??