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Old 09-24-2020, 01:20 PM   #1
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Low point drain?...

Just confirming there should be +/- 5 gallons remaining in the fresh water tank after opening the low point drain?

Thanks in advance for the response(s).
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Old 09-24-2020, 06:12 PM   #2
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Old 09-24-2020, 06:36 PM   #3
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From an old thread in another forum:

Most Trailers have a drain for the FW tank that is located very near the FW tank. This will drain water out of the tank, but not necessarily out of the piping inside the trailer.

The low point drain is for draining water out of your water lines within the trailer. It will NOT necessarily drain water out of your FW tank.


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Old 09-24-2020, 06:48 PM   #4
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Depends... every R/V is seemingly plumbed differently. Some have the drain port on the bottom of the tank while others are on the side of the tank leaving several gallons of liquid in them.

Do you know where your drain port is located on the tank?

Also... you mention opening the "low point drain."
What are commonly referred to as low point drains do not drain the fresh water tank. That is a separate drain.
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Old 09-24-2020, 07:56 PM   #5
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Quote:
Originally Posted by TrailWayz View Post
Just confirming there should be +/- 5 gallons remaining in the fresh water tank after opening the low point drain?

Thanks in advance for the response(s).
I don’t know the answer, but why are you asking? Winterizing?
You probably know there is a separate drain for the fresh water. I plan to open all three when I winterize.
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Old 09-25-2020, 01:02 AM   #6
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The low points wont drain the tank, just the plumbing system. There's a drain on the tank for that...

I also will usually use the jacks to tilt the rig towards the side of the tank the drain is on (in my case drivers)
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Old 09-25-2020, 04:37 AM   #7
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Quote:
Originally Posted by milkman55 View Post
I don’t know the answer, but why are you asking? Winterizing?
You probably know there is a separate drain for the fresh water. I plan to open all three when I winterize.
I did not know there was a separate drain for the fresh water tank! Thanks.

Do you know where that is located? I did not see anything in the plumbing schematic.

You also mention 'opening all three' which three valves are you referring to?
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Old 09-25-2020, 04:38 AM   #8
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Quote:
Originally Posted by FOURWHL View Post
The low points wont drain the tank, just the plumbing system. There's a drain on the tank for that...

I also will usually use the jacks to tilt the rig towards the side of the tank the drain is on (in my case drivers)
Thanks, I will look for it tomorrow!
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Old 09-25-2020, 07:09 AM   #9
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Fresh water tank drain on the back wall between the two fresh water overflow pipes.

Low point drain for hot and cold on the wet bay panel.

Total of three. I leave them open in winter but I am only winterizing for temps down to about 32f, which is pretty much the coldest we get and I also store indoors which is additional protection from wind chill.

I do put pink RV antifreeze in the P traps and a little in the grey and black tanks to settle down around the valves.
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Old 09-25-2020, 07:18 AM   #10
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Quote:
Originally Posted by milkman55 View Post
Fresh water tank drain on the back wall between the two fresh water overflow pipes.

Low point drain for hot and cold on the wet bay panel.

Total of three. I leave them open in winter but I am only winterizing for temps down to about 32f, which is pretty much the coldest we get and I also store indoors which is additional protection from wind chill.

I do put pink RV antifreeze in the P traps and a little in the grey and black tanks to settle down around the valves.
Thanks, Milkman. That is very helpful.

So I did not open the low point drains. I only opened the fresh water tank drain and was left with about 5 gallons in the tank that I had to vac out. I guess that is normal? I will try FOURWHL's recommendation of tilting the coach with the levelers in the future. I supposed I should have thought of that.
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Old 09-25-2020, 08:58 AM   #11
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I will pull the cover over the bed when I drain my fresh water and see how much drains out. You would think “drain” means empty. I need to pull the filter out of the water filter housing for winterization.
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Old 09-25-2020, 09:23 AM   #12
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I've also had decent luck tilting the tank towards the pump pickup, then pressurizing the pump and opening the low points (call it a pressurized drain).

That said yes I do always have some leftovers. I have never really concerned myself with it and after 3 wisconsin winters it's never been a problem. After I set back level I assume there's room for what's in the pickup/pump to drain back into the tank.

The pump would be the biggest worry, so if you have a winterize feature, using the RV pump to draw antifreeze would take care of that. A little water freezing in the tank isnt going to hurt anything.
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