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Old 05-04-2016, 09:08 PM   #1
WFD
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What is this part of my plumbing?

Can anyone tell me what this black part is in my bathroom plumbing system. It has a supply hose rising up to it then has a hose going back down into belly of trailer. It also has a directional flow arrow on it. Just curious as to what it is, it's not giving me any grief, but I just want to know what it is.
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Old 05-04-2016, 09:09 PM   #2
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Vacuum breaker, back flow preventer
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Old 05-04-2016, 09:14 PM   #3
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For your black tank rinser. I had to replace mine because of leaking. When I took it off found out it may have been the funky plastic clamp they put on the hose. Replaced with metal one. Click image for larger version

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Old 05-04-2016, 09:21 PM   #4
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Quote:
Originally Posted by WFD View Post
Can anyone tell me what this black part is in my bathroom plumbing system. It has a supply hose rising up to it then has a hose going back down into belly of trailer. It also has a directional flow arrow on it. Just curious as to what it is, it's not giving me any grief, but I just want to know what it is.
Yep, as said what it is. Here's a generic install picture:
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Old 05-04-2016, 09:28 PM   #5
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X3, black tank backflow preventer
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Old 05-04-2016, 09:41 PM   #6
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ok....thanks a bunch for the quick replies.
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Old 05-04-2016, 09:45 PM   #7
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Mine was seeping so I removed it and the hose and reconnected the hose to the black tank flush inlet which has a back flow preventer also. It works great without the added BFP and hose.
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Old 05-05-2016, 12:28 PM   #8
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That was a good post. Mine leaked once and I removed the shower controls to get access to that device. As I was away from home and had sealant with me, I reinstalled the controls and it hasn't leaked since. I say it's a good post because it tells others about this device and how it may become a problem.
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Old 05-05-2016, 01:05 PM   #9
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Back flow valve for black water tank. I found out the hard way when factory installed it backwards on my new XLR. Toilet flusher wouldn't work. No big deal to turn it around.
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