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Old 02-10-2021, 07:51 PM   #1
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1990 34.5' Airstream 345
Marina Del Rey , California
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Water pressure regulator failed, 1990 345LE

I wonder if anyone has had a failure of the Watts Regulator city water pressure reducer valve? (I'm now working on refurbishing the water system) - I tried filling the tank with the autofill switch last weekend while on a test drive to a RV site overnight - it always used to fill to about 3/4 full back when i first owned this coach in the 90s. But this time, it autofilled to about 1/4 fill and stopped. Then, when i disconnected the hose from the camp site faucet and turned the water pump on in the coach, i found that water was spurting back out of the fill hose. This stops when i turn off the water pump. I *think* that that there is a 1 way valve in the Watts device, if i remember, which would make sense if the regulator has failed (it's completely corroded), also possible is that the autofill valve has failed, but I'm not so sure about that. Here's a couple of photos...anyone seen this?
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Old 02-10-2021, 09:47 PM   #2
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Yes, there is a check valve in that

A pex ball type check valve + camco regulator is an easy solution
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Old 02-11-2021, 12:52 AM   #3
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2005 34' Classic S/O
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Throw the watts regulator in the garbage and install a camco check valve. Upgrade the auto fill solenoid to 1/2” or 3/4” for filling the tank faster. The auto fill uses the crappy sensor system that Airstream installed when new in conjunction with the circuit board installed over the stove. If it doesn’t work try a Sea-Level system for replacement, but at least filling the tank will only take 5 mins instead of 20, Regards, Bob
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Old 02-20-2021, 08:58 PM   #4
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1990 34.5' Airstream 345
Marina Del Rey , California
Join Date: Oct 2020
Posts: 28
Many thanks for advice - here's what worked!

The Camco check valve and a new pressure regulator and a whole bunch of messing about with pex cinches fixed the problem! All good now. I also found that the whole of the rear curbside floor has been getting wet for years due to the overflow outlet at the top of the water tank (that spits the water back out when the tank is full) was almost off. So whenever the tank was being filled instead of water being expelled from the little hole below the filler in the eternal curbside body, the overflow was mostly going into the compartment. I think the coach floor structure is not too affected. I'll keep an eye on it. However, the rear curbside compartment floor has completely rotted. So i'm getting that repaired/refabricated this week. Photo of that also below.

I also discovered that there is another input connection on the water tank at the top rear on the back side that is nothing connected to it. it is pluggd with a square black plastic screw. but the actual connector is loose and leaking. I'll be epoxy gluing that back on tomorrow. As always it's a privilege to have access to the wealth of knowledge in this forum, many thanks to all that lean in and help! Warmest, Will
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Old 02-21-2021, 08:15 AM   #5
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1982 31' Airstream 310
Columbia , Tennessee
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Good luck on the floor repairs. Here is what a little water leaking looks like, over 3/4 of the rear floor replaced!

I do not have the watts regulator anymore, it was gone when we got the coach. I always use a regulator on the hose connection to water source!
We had a hose burst in the night due to a high water pressure supply. Now always use the in line regulator!Click image for larger version

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Old 02-21-2021, 08:22 AM   #6
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1982 31' Airstream 310
Columbia , Tennessee
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All PEX now, with no more plastic fittings!
Both of my fill hoses just fell of when I moved the tank!Click image for larger version

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Chris & Brenda....................cMADMAXman
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1991 350LE "Zephyr"
1982 310 MoHo
Many Years ago, 1972 Argosy 24' trailer
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Old 02-21-2021, 11:39 AM   #7
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Fill hose and vent!
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1982 310 MoHo
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