What is this?

[Re-Pete]

I'm doing a makeover of our '92 Excella. This will include our plumbing as things will move to some extent. Can anyone identify this device on my FW supply line.
Thanks,
Pete

[GMFL]

It’s a vacuum breaker.
http://www.watts.com/pages/_products...ls.asp?pid=917

[TG Twinkie]

It is a vacuum breaker. Look for it on the net.

[Re-Pete]

Originally Posted by GMFL

It’s a vacuum breaker.
http://www.watts.com/pages/_products...ls.asp?pid=917

Originally Posted by TG Twinkie

It is a vacuum breaker. Look for it on the net.

Thanks for the help. Any idea what it's purpose was? I'm just spit balling at this point, but could it be used in connection with a black tank rinser that's built into my unit?
Thanks,
Pete

[OTRA15]

That would be one of its main functions Pete, although I am somewhat surprised that you have a built-in black water tank rinse system. Does your owner's manual discuss this?

In our 2014 FC20, the plastic anti-siphon vacuum breaker under the bath vanity [dedicated only to the water supply line for our black tank rinse system] leaked, and our dealer supplied a new brass unit which we have not had time to install. [The dealer was too far away to justify a trip back there IMO.]

In general, a vacuum breaker prevents the Airstream from sending water back into the city/CG water system [when pressure drops there], because it might be contaminated in some fashion. Many building codes now require this in new residential construction FWIW.

Happy trails,

Peter

PS -- Using the new search function in the blue box above, "anti siphon vacuum breaker" yields these earlier threads/posts here:

https://www.google.com/search?q=anti...=airforums.com

See also: https://en.wikipedia.org/wiki/Vacuum_breaker

[Re-Pete]

Originally Posted by OTRA15

That would be one of its main functions Pete, although I am somewhat surprised that you have a built-in black water tank rinse system. Does your owner's manual discuss this? ...

Happy trails,

Peter

Peter, Yeah, I was surprised also to find that we had one. And yes, I do believe it's mentioned in our owner's manual although I confess that it's been a while since I looked at it. I'm pretty sure it's how I figured out what the hose fitting was for. [emoji12]
Thanks for reminding me to look at my manual.

Pete

Sent from my Pixel 2 XL using Airstream Forums mobile app

[Re-Pete]

Thanks to OTRA15's reminder, I took a look at my AS manual and low and behold in section F page 14 there was a drawing showing the Black Tank Flush Assembly, including the Vacuum breaker. Knowledge is power, I've been curled up with the manual all morning.
Pete

[rmkrum]

Just look at the manual as a rough draft. It’s ok, but not superb...

[OTRA15]

The older manuals are more thorough IMO, perhaps because the systems were simpler back then, and often were similar in various models and model years. The OP has a 1992; we had a 1985 25'.

Still your point is well taken -- just a rough draft manual.

Thanks also for your shag rug comment in that Argosy thread!

Cheers,

Peter