[KenS]

Thanks Captain jclark. I will check for access panels. I haven't ruled out anything yet. I replaced the duck bill valves and the toilet seal and ball seal and still have a vacuum leak. The waste line in the engine room from the bulkhead to the tank is cracking so I assume it might be that way inside the hull as well. I still have some investigating to do but i was wondering how difficult it would be to swap out the hose. If it is not to difficult I would consider doing it as a preventative measure.