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Old 02-09-2019, 07:30 AM   #1
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1980 31' International
1966 22' Safari
Cincinnati , Ohio
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What is this plumbing fitting?

We are working on replacing the copper tubing on our 1966 22' Safari, as the faucets in the shower and bathroom sink are leaking. The attached photo is taken from in the bathtub looking into the tiny access area under the bathroom sink. What is the capped off looking fitting in the lower section? The two lines going into the wood are to the bathroom sink faucet, but I am not sure about this odd one...
Thanks so much!
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Old 02-09-2019, 08:41 AM   #2
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1991 25' Excella
2011 19' Flying Cloud
Santa Ynez , California
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No experience with the vintage trailers but looks possibly like a vacuum breaker, does it come from the bath faucet?
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Old 02-09-2019, 02:47 PM   #3
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Is that fitting close to the city water feed? Similar to what Alan said . . . maybe an anti-siphon valve to prevent the trailer’s water from going back into the city water supply in the event of a pressure drop in the system? Seems unusual for an older unit IMO. Maybe a prior owner re-plumbed things?

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Old 02-09-2019, 04:00 PM   #4
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1974 31' Sovereign
Tyler , Texas
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I'd guess a water hammer arrestor, especially if the orientation is with the cap end pointing skyward.
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Old 02-10-2019, 11:41 AM   #5
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1966 24' Tradewind
1995 34' Excella
Lynchburg , Virginia
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That is a vacuum breaker. My 66 Tradewind had one (see photo). I removed it as we went with a porta potty.

I replaced all the plumbing lines with Pex. There are writeups and photos in my thread- Dan’s 66 Tradewind Improvements.

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Old 02-11-2019, 05:34 AM   #6
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1980 31' International
1966 22' Safari
Cincinnati , Ohio
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The fitting is oriented upright, with the cap end pointing towards the underside of the bathroom sink (which in this photo is the plywood). If this is a breaker, do we need to replace it when we replace the copper lines with PEX? There is a bell shaped regulator just inside of the city water connection, which we were going to replace to prevent back-flow to the city hookup, but now I’m not sure if we need this fitting?

Thank you for all of your help (and Dan for the info on your water line replacement), we appreciate it!
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Robb, Jenn & The Brown Dog (Dex)
Maizie, The Black Dog, May You Rest Peacefully
1980 International 31
1966 Safari 22
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Old 02-11-2019, 06:39 AM   #7
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1996 25' Excella
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If it is a vacuum breaker you don't need it since there is usually a n antisyphpn on the Park water tap. New trailers usually have one only on the black tank flush fitting
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Old 02-19-2019, 03:46 AM   #8
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1980 31' International
1966 22' Safari
Cincinnati , Ohio
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Posts: 238
Thank you all for your help! I will eliminate it when we install the new PEX lines.
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Maizie, The Black Dog, May You Rest Peacefully
1980 International 31
1966 Safari 22
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