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Mike those are backflow preventers but not the ones that Carl is talking about. The two lines that Tony is talking about are under the bathroom sink and are connected to a backflow device for the black tank rinse lines. They have a real tendency to go bad and either cause a leak under the sink or even flood the bedroom or bathroom. It is a larger black plastic one way valve that stops the water from the black tank from back flowing into the main or campground lines. If you go to the Search Engine here at the top of the page and type in Black Tank Backflow you will see plenty of posting about this and a lot of the threads have pictures of the factory installed valve. A lot of us have replaced it with a metal backflow valve from the big name hardware stores in their plumbing department.
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