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Old 02-27-2021, 02:19 PM   #1
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Nashvilleville , Tennessee
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Exclamation Water leaking from mystery drain. Help!

Hey all,

I have a very fast water leak from a drain pipe that I do know about. I say a leak because the water consistently leaks from this pipe very fast. If this drain is operating correctly then I am wasting an incredible amount of water and need to figure out why it's happening. This leak happens when connected to city water. When I am just using the pump it still leaks but much slower drips.

I am pretty sure this is now the low point valve. When I do go and turn on the low point valve water starts rushing out a different drain pipe than the one I am seeing a leak from. There are 2 drain pipes next to each other by the wheel well. I attached a photo of the assembly where I the leaking drain valve is attached to. It is in line right after the city water regulator. Its like some sort of check valve filter something I do not know really. Its a small part I circled in yellow.

Anyone know what this part is and why it is leaking or draining water so quickly?
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Old 02-27-2021, 02:28 PM   #2
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It is *not* the low point drain. I will also add it is not the fresh water tank drain. As far as I can tell the drain pipe that leaks is attached directly to that part I circled.
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Old 02-27-2021, 02:52 PM   #3
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It looks like the high pressure relief valve. If to much pressure builds in the plumbing system it's designed to open, relieve the pressure then close again. Yours has probably become defective and needs to be replaced.
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Old 02-27-2021, 03:10 PM   #4
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Clueless but I do have a question. On the label the red printing what does it say? And is that pipe cold or hot?

And if you identify the model and year that can help too.
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Old 02-27-2021, 03:31 PM   #5
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Quote:
Originally Posted by DremStremer View Post
It looks like the high pressure relief valve. If to much pressure builds in the plumbing system it's designed to open, relieve the pressure then close again. Yours has probably become defective and needs to be replaced.
This would make a lot of sense. When I first got this and hooked up to city water it wasn't leaking so crazy. I also had a 50psi regulator on the hose. I connected to a different water tap and did not have the regulator so the water was flowing in at whatever the well pump was pushing out to the tap. Maybe that prolonged exposure to the pressure increase broke something in there... being its a 40 year old part.
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Old 02-27-2021, 03:33 PM   #6
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Originally Posted by GCinSC2 View Post
Clueless but I do have a question. On the label the red printing what does it say? And is that pipe cold or hot?

And if you identify the model and year that can help too.
All I can make out is "Webster No. 111 Set 125lbs". Its part of the old city water copper piping so cold.
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Old 02-27-2021, 03:34 PM   #7
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1978 Sovereign
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Old 02-27-2021, 06:28 PM   #8
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Post 3 is looking promising.
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Old 02-28-2021, 12:42 PM   #9
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Originally Posted by bhel View Post
All I can make out is "Webster No. 111 Set 125lbs". Its part of the old city water copper piping so cold.
Yeah sounds like over pressure relief valve originally set to 125lbs.
40+ years later, no surprise spring holding it closed is less then 1/2 strength.
EDIT; Better then failing closed and causing other problems.
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Old 02-28-2021, 01:57 PM   #10
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It’s this.
https://m.ferguson.com/product/watts...dFamily-232755
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Old 02-28-2021, 05:20 PM   #11
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Back in the 70's when Airstream used copper plumbing they include one or more pressure limiting valves to protect the rest of the coach plumbing. It was a measure of over engineering as you can see a pressure regulator plumbed in next to it. Historically the valve will age out and begins to leak as you describe it. Post #3 is correct. The common fix is not to replace it rather simply remove it and insure you use an external pressure regulator.
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Old 03-01-2021, 10:35 AM   #12
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Originally Posted by Wazbro View Post
Yeah sounds like over pressure relief valve originally set to 125lbs.
40+ years later, no surprise spring holding it closed is less then 1/2 strength.
EDIT; Better then failing closed and causing other problems.
That's an excellent point I would rather is leak than break valves haha.
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Old 03-01-2021, 10:36 AM   #13
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Thanks all! I will probably end just deleting it when I do some updating with my water pump in a few weeks.
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Old 03-01-2021, 10:56 AM   #14
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Before deleting it, check your water heater to make sure there is a relief valve installed there. As water heats up it will expand and because a trailer's plumbing is a closed system this water expansion will create pressure in the pipes. At least one pressure relief valve is needed in the system to prevent pipes bursting. I believe all water heaters have a relief valve installed, just something to verify.
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