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Old 01-20-2014, 03:16 PM   #1
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What is this?

While looking under the bathroom counter of my 2006 Holiday Rambler Admiral SE at the plastic sink (soon replaced), I spotted this and wonder what it might be.

All help is greatly appreciated.

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Old 01-20-2014, 03:19 PM   #2
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On our DSDP it's a vacuum breaker for the black tank flush.
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Old 01-20-2014, 03:20 PM   #3
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valve

it looks like an inside vent valve. one way flow
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Old 01-20-2014, 03:20 PM   #4
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It's s vacuum breaker.
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Old 01-20-2014, 03:50 PM   #5
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Anti-siphon vacuum breaker. Google knows everything.

288A Hot or Cold Water Anti-Siphon Vacuum Breakers, Vacuum Breakers, Backflow Prevention - Watts Canada

And if your next question is "what's it there for?" then this is why:

http://en.wikipedia.org/wiki/Vacuum_breaker

I'm not a plumbing expert, but it begs the question, if you already have a check valve at your water inlet, why would you need a vacuum breaker? I thought check valves were pretty much standard on an RV and are typically integral to the water inlet.
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Old 01-20-2014, 03:51 PM   #6
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Quote:
Originally Posted by gonefishin77 View Post
While looking under the bathroom counter of my 2006 Holiday Rambler Admiral SE at the plastic sink (soon replaced), I spotted this and wonder what it might be.
All help is greatly appreciated.
gonefishin77
As Clifftall said, "Vacuum Breaker":
https://www.google.com/#q=vacuum+breaker
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Old 01-20-2014, 04:11 PM   #7
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Thanks for the quick replies, knew it had one but didn't know where it was.

Still learning where everything is, the information I get and help received from everyone here at IRV2 is much appreciated!!!
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Old 01-20-2014, 04:35 PM   #8
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Thanks for the quick replies, knew it had one but didn't know where it was. Still learning where everything is, the information I get and help received from everyone here at IRV2 is much appreciated!!!
We're all still learning. It will be sad when we get to know it all. Thankfully none of our members are there yet
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Old 01-20-2014, 04:48 PM   #9
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To myredracer- the reason for the vacuum breaker is that a check valve is not recognized in the plumbing industry nor by any standard as being a back flow preventer, a device installed to protect the potability of your water supply. By design, check valves are permitted to allow leakage and therefor not adequate protection for the water supply.
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Old 01-20-2014, 07:14 PM   #10
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vacuum breaker just had to replace mine got it from Granger for $20
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Old 01-20-2014, 08:20 PM   #11
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To myredracer- the reason for the vacuum breaker is that a check valve is not recognized in the plumbing industry nor by any standard as being a back flow preventer, a device installed to protect the potability of your water supply. By design, check valves are permitted to allow leakage and therefor not adequate protection for the water supply.
Interesting! So would that mean that all RVs should have a vacuum breaker? And if there isn't one, it'd be a good idea to add one? Three TTs so far and no vac. breaker.

These would normally be near the line to your toilet, correct? Don't know how you would add one if the piping is under the floor.

I just bought a couple of check valves at a wholesale plumbing shop today. One is a wye shaped one with a flapper valve, metal to metal. Doesn't seal very well at all. The other one is in-line and has a rubber gasket in it. Similar to what's in an RV water inlet. Seems to seal pretty tightly and has a spring inside. Do you know if there is a difference in the application of these? Even if the inline ones sealed okay at first, I could see them possibly getting fouled with sediment and stuff and preventing a tight seal.
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Old 01-20-2014, 08:30 PM   #12
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Originally Posted by gonefishin77 View Post
Thanks for the quick replies, knew it had one but didn't know where it was.

Still learning where everything is, the information I get and help received from everyone here at IRV2 is much appreciated!!!
You're welcome!
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Old 01-20-2014, 08:49 PM   #13
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Most tank flush systems have a vacuum breaker. Unless, it was added after the fact or was just that low from the factory.
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Old 01-21-2014, 08:47 AM   #14
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Originally Posted by myredracer View Post
Three TTs so far and no vac. breaker.

These would normally be near the line to your toilet, correct?
I just bought a couple of check valves at a wholesale plumbing shop today. One is a wye shaped one with a flapper valve, metal to metal. Doesn't seal very well at all. The other one is in-line and has a rubber gasket in it. Similar to what's in an RV water inlet. Seems to seal pretty tightly and has a spring inside. .
myredracer
IMO, because all RV toilets, (and black tank flush water supplies), have a built in vacuum breaker, there is no reason to add a vacuum breaker to the plumbing of a commercially built RV.

BTW, many campground faucets, and other outside water faucets, have a vacuum breaker like this, https://mail.google.com/mail/?tab=wm...3b1b5748fc82e1, permanently attached.
Some residential outside faucets like this one, Woodford Model 17 Anti-Siphon Outdoor Faucet, have a built in vacuum breaker.

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