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Old 09-10-2011, 05:23 PM   #1
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Help with plumbing layout

I'm sure that this has been covered, but I am having no luck finding it. I'm just still trying to wrap my head around the plumbing vents. Someone straighten me out.

I am looking at a diagram from 76, since it is similar but with a gray tank. Am I correct that I only need 1 roof vent and all the holding tanks and sink drains just connect to that? Can the fresh tank share the same roof vent?
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Old 09-10-2011, 05:39 PM   #2
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The fresh water tank is not vented. You will need a vent for the black tank that will most likely tie into a vacuum break for the sink in the bathroom, Another vent in the front for the vacuum break for the kitchen sink.
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Old 09-10-2011, 06:27 PM   #3
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My 76 Argosy does have a gray tank vent. The sinks all tie into this vent and it then weaves its way up to the roof vent.
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Old 09-10-2011, 06:46 PM   #4
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What is the purpose of the vacuum breakers? It would be impossible for the fresh water to become contaminated since it is a separate system. Is it to prevent backflow into the sink from the gray tank?
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Old 09-10-2011, 06:50 PM   #5
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Here is a diagram from a 75.
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