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Old 10-06-2014, 10:54 AM   #1
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Another plumbing ?

Can someone advise as to what the clear plastic item pictured is and its function. Have an 08 GH 31ss and is in the BWT flush line. The inlet pipe connects to the bottom of the clear plastic item, and the outlet pipe on the right goes back down to/thru the floor and disappears to the BWT spray heads I assume. All of this is located under the Bath vanity sink. Wife notice some water on the shelf under the sink after using the BWT flush last week when packing up for the trip home. We also heard a "buzzing" sound or like the water pump was running (it was not as we were CG water), she was in the bathroom and I was at the BWT flush connection outside and the water control panel is adjacent to the BWT flush connection on the outside wall of the bathroom. The exit connection looked like it was cross threaded so I disconnected the exit pipe and then re-connected it.



Also, should there be some Teflon tape on these connections ??

The first 2 times we used the MH the BT was not flushed using this connection (forgot the MH had it) but used it when we got to the CG while the BWT was empty and then when we dumped the tanks as well. Did not notice any water on the bathroom floor, so unfortunately, the particle board shelf absorbed the majority of the water.
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Old 10-06-2014, 11:08 AM   #2
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looks like a back flow valve
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Old 10-06-2014, 11:19 AM   #3
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I would say that it's a check valve, in other words a back flow preventer, you should not need tape on the fittings, they have a rubber seal made in them, just tighten them up
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Old 10-06-2014, 11:29 AM   #4
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http://www.airforums.com/forums/f444...ak-124696.html

this is just one thread of many on google saying how bad they can leak after they wear out. plus they do start to make noise before they completely fail...

it likely isn't leaking from the connections but right out of the top of the unit

Sounds like you can get a brass one but haven't found a part yet
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Old 10-06-2014, 11:40 AM   #5
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https://recreationnation.me/main/con...ush-valve-assy

black tank vacuum breaker valve is another name


another Valterra link
http://www.valterra.com/product/chec...-1-2-mpt-bulk/
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Old 10-06-2014, 04:12 PM   #6
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Quote:
Originally Posted by nbhybrid View Post
https://recreationnation.me/main/con...ush-valve-assy

black tank vacuum breaker valve is another name


another Valterra link
http://www.valterra.com/product/chec...-1-2-mpt-bulk/

The valterra link shows the same as mine, so do all RV shops keep these items in stock?

The link is to a 1/2", is 1/2" pex a common size in most RV/TT's??

Do I really need this check valve ???
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Old 10-06-2014, 04:49 PM   #7
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Quote:
Originally Posted by jimp View Post
Do I really need this check valve ???
Yes. I have seen a post where someone replaced it with a one way valve or backflow valve.Unsure what happened. but this valve acts like that but more importantly it is an Anti-siphon.

google "rv anti siphon valve" there are lots of posts on different forums
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