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Old 11-18-2014, 01:25 PM   #1
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Any idea what this part is?

Hello, in the attached image there are two red water lines running to this part. Is it a pressure relief? It is under the vanity.

I had some water leaking from it when I was dumping and had the black tank flush hooked up. I thought it was odd that leaking. I would have thought that the flush for the black tank line would run directly to the black tank.

Thoughts?

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Richard

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Old 11-18-2014, 01:37 PM   #2
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It is a vacuum break valve for the black tank. Just had to replace mine too.
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Old 11-18-2014, 03:46 PM   #3
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It keeps the black tank from siphoning the contents out the black tank flush hose. They do go bad.
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Old 11-18-2014, 06:22 PM   #4
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i think its called a back flow preventer
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Old 11-18-2014, 07:42 PM   #5
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A black flow preventor connecting the black tank and the ?.
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Old 11-18-2014, 07:50 PM   #6
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Red lines are usually hot water ???
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Old 11-18-2014, 08:04 PM   #7
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Just a guess, but a pressure relief valve ?
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Old 11-18-2014, 08:19 PM   #8
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back flow preventer to prevent water from accidently siphoning back through your hose if the water supply losses pressure while connected to the black tank.
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Old 11-18-2014, 08:48 PM   #9
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Quote:
Originally Posted by macandphyl View Post
Red lines are usually hot water ???
With pex,color does not matter, probably used whatever was on hand. When I fixed some frozen/broke pipes, I used blue on hot water line with red tape at the joints.

Another questiion is why in that location, when to alot of trouble to put in the vanity.
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Old 11-18-2014, 09:38 PM   #10
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188A Anti-Siphon Vacuum Breakers for Irrigation Systems, Vacuum Breakers, Backflow Prevention - Watts

Does it look like this?
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Old 11-18-2014, 10:24 PM   #11
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Just replaced mine. It cracked last winter. Blow out the black tank line when winterizing.
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Old 11-19-2014, 05:11 AM   #12
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Yes, but the top part that is chrome on this picture is black plastic on mine.

So this can be purchased at a plumbing supply house?

Thanks for the responses!

Richard
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Old 11-19-2014, 05:34 AM   #13
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It is a vacuum break and they mount them high so when it sees a vacuum it will beak open and it can suck air in.
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Old 11-19-2014, 11:33 AM   #14
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There are many different kinds of valves. Clear plastic, Gray plastic, brass ones, ect. & mine is in the vanity too,
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