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Old 09-15-2021, 11:32 AM   #1
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What is this valve for?

Hi everyone. I am trying to figure out the plumbing and water system in my 1982 empress RV. I just replaced the pump for using the fresh water tank. Does anyone know what this Valve does? There is a small grey tube that goes down into the floor but I cannot see where it goes. And I donít see any water coming out anywhere from it or underneath the RV. Thanks for your help.
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Old 09-15-2021, 12:03 PM   #2
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The way the pump is installed that is the Suction Side of Pump

So if valve was Open it would suck air in

Not OEM for sure......
Could be for sucking in anti-freezer for winterizing the RV Plumbing
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Old 09-15-2021, 12:24 PM   #3
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Thanks for the reply. So I am assuming that I should always keep it off when using the pump? Sorry, plumbing is not my strong suit!!
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Old 09-15-2021, 01:06 PM   #4
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May just be a tank drain.

It would pull air from the tank before it sucked up antifreeze.
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Old 09-15-2021, 01:17 PM   #5
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Certainly looks like an owner-install, and a poor one.


I would drain the tank and run a new piece of hose from tank to water pump with length of hose such that the hose meets both ends straight on instead of at any angle.


Could it drain the tank if open. Sure-- and completely soak that wood floor! DON'T DO THAT!
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Old 09-15-2021, 01:20 PM   #6
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Well I hate to say it but it looks like the water has been leaking around this area for a long time .

Lack of clamp on the fitting and the hose being taped onto the pump, are problems .

You need a fitting like this picture to stop the leak from the pump inlet and more gear clamps to fix the leak at the fitting .
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Old 09-15-2021, 01:30 PM   #7
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Both of my coaches have had a drain to empty the tank and low point drains for winterizing with hose exiting the bottom of the RV . On the 91 coach I also had a similar hose to pull RV drinking water antifreeze into the system to prevent freezing. I did not like the aftertaste left by the antifreeze and switched over to a regulated air chuck. This has worked fine for me about 15 years here in Alaska, just takes time and careful maneuvering of the valves.

It does look like two clamps were left off as part of the new pump install. The suggested part upgrade might be a good idea or at least installing the two missing clamps- before the shaking on the road works the hose off.
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Old 09-15-2021, 06:33 PM   #8
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Thanks so much. Where can I can buy those fittings that are in the picture? I have taken everything out and going to redo the entire setup.
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Old 09-15-2021, 06:42 PM   #9
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Originally Posted by amihailidis View Post
Thanks so much. Where can I can buy those fittings that are in the picture? I have taken everything out and going to redo the entire setup.
The fittings , I pictured , came with a replacement pump for my coach any RV parts store should have them , could be on Amazon , but I'm not sure .
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Old 09-15-2021, 06:52 PM   #10
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Rube Goldberg would be proud of that drain! Why anyone would put what looks like a icemaker water line valve in to drain the tank is ???????? The tank would probably drain almost as quickly by evaporation
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Old 09-15-2021, 08:00 PM   #11
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Is it for an ice maker line to the fridge?
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Old 09-15-2021, 08:13 PM   #12
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Looks like you have some black mold on that wood from a long-time leak. Some people are real sensitive to that. You could start by spraying some bleach on it try to clean it up. You might want to read up on it, some people take a lot of precautions when cleaning it.
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Old 09-16-2021, 10:31 AM   #13
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Is it for an ice maker line to the fridge?
That could be IF..IF it was on Discharge side of pump

Way pump is installed.....it is on suction side of pump


Maybe Pump was installed backwards????
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Old 09-16-2021, 11:09 AM   #14
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Looks like a tank / pump drain, Others are right, in that looking at the size of the drain line it will take two weeks to drain the tank.
You already know that the black plastic tape won't hold that tube to the pump. So put a clamp on the pump and valve connections ! AND replace that valve with a bigger drain tube. And bleach the floor and paint it with "Kilz".
Report back when done.

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