Issue number three:
When using a normal sewer hose the compartment door cannot be closed.
I first purchased a 45 degree clear elbow - and the door would still not close. Took the elbow back and purchased a 90 degree one. That works. Now, when hooked up at the campground we can close the compartment door. By-the-way, the photo also shows the underside of the access port which is used for hose and coax access.
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