Holding tank collapsing fix

[egstasea]

I like your pool noodle idea, and I do think that will work.  On my 40 Express, I added a tee before the charcoal filter and ran a new hose zip tied a to the engine room ladder with a quarter turn valve at the end.  When I go to pump out I open the valve for an unrestricted supply air path for the tank.  I used a full port valve.