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Old 01-08-2013, 12:38 PM   #2
Senior Member
Join Date: Apr 2007
Location: Camano Island, WA
Posts: 163

the main reason for venting the tanks is to allow air to flow in to the tank when you are dumping the tank into the waste station, this prevents a vacuum and allows the wast to flow freely down the drain. Same reason plumbing fixtures in your house are vented. The little portable toilets do not have the volume to need a vent to dump/pour out.
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