On Nov 30, 2:50*pm, "Mack29" wrote:
I have a park model RV (38 ft). The RV is permanently set on a site in an
RV park. (This is a weekend/vaca home) We have a permanent sewer hook up
from RV to sewer via flexible pipe.
Occasionally the toilet bowl will drain. It seems to drain slowly. It's
most noticable overnite or when we arrive for weekend stay.
There are no noticable leaks inside around the toilet or under trailer
around the pipe or connections.
Other than bowl draining toilet operates fine.
Could this be an issue with the plumbing vent stack being blocked ?
Any other thoughts or suggestions ?

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Sure sounds like a vent problem. Negative pressure pulling the water
out. Time to go up top and snake out the vent. Or just use a garden
hose.