iRV2 editor shows how to install 360 roof vent siphon

(July 18, 2012) --  Some RVs will have multiple holding tanks and what is placed in the tanks needs to be vented for a number of reasons. If there is any pressure in a tank and a person opened a blade on a toilet, that could be a very unpleasant experience - therefore venting prevents any surprises, Pelchat noted. "Many RVs have original equipment caps that promote a positive pressure in the stack and therefore push out odors inside the coach," he said.