Originally Posted by dunnnc
The vent pipe is strictly for preventing the tanks from collapsing during the emptying process.
I respectfully disagree with that statement....at least the word "strictly". When you flush water down the toilet, that should start a slight air pressure increase in the tank. Ideally, instead of that extra air blowing back up the toilet connection, it should start the air flow up the vent pipe, and keep that flow going until the toilet valve is closed, so no fumes enter the camper.
And what about tank heating during the day ?? With the pressure increase, if the vent wasn't there, then you open the toilet valve and all of those fumes blow back into the camper.
The vent pipe serves several purposes, not just 1.
Chap , DW Joy, and Fur Baby Sango
2006 Ford F150 Super Cab 4x4
2008 Surveyor 263