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Old 09-21-2021, 06:23 PM   #21
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Model: Sunstar 29VE Winnebago
State: Texas
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THOR #13058
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Originally Posted by Chateau_Nomad View Post
dk - edumacate me... when you do your "40psi blowout" do you have the pump ON - even briefly? Would that be necessary, or would it depend on how the plumbing is routed? I'm thinking about adding this to my winterize routine.
I have pump off.

From my view when I turn pump off and drip dry (minute or two) I am 99.9% water free and ready for the next Texas freeze. But I pull out the compressor and blow my lines just to watch it spit what little residuals it can find. I got a nice compressor with pressure regulator; plus a really really nice blowout plug adapter, by golly I am gonna use them whenever I get a chance

I don't see the plumbing being a factor other the technonese about which faucet you may wish to open first as you go from fixture to fixture. I just start with the one my beer is closest to, or 1st first one I see

btw, I ordered the Aerospace 303 Wipes. When my current spray bottle of 303 goes out, I will see if the wipes work better and last longer? I think it may because I don't have to spray on microfiber cloth and one wipe may do a lot more than I think? It comes with 40 wipes. And my favorite part, it is about $5 cheaper. I know most RV owners don't seem to care about cost of stuff; seems like if you can buy RV you are automatically afforded an unlimited supply of gas , but to me being thrifty is how I was able buy my RV, and saving money is a fun part of the entire game.

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2019 Sunstar 29VE Sumo Springs; Safe T Plus; EC-30 AGS; Vmax 250ah AGM; Nighthawk X4 AC2200 WiFi EX7300; H/W Heater / Chassis Disconnect Switches; Southwire Surge Guard 44270 & 34951 w/Monitor 40301; Jet Flo Macerator; Alpine SPE500 Speakers; Visio M21D-H8R
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Old 09-21-2021, 11:16 PM   #22
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Originally Posted by dkoldman View Post
Where is your line that feed the water pump, and when your pump has pumped all the water that it can physically pump from your tank; how much water do you think is still left in tank? OP is saying he has 10 gallons left
Maybe a gallon, fitting is on the other end if the wall at the bottom
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Old 09-21-2021, 11:37 PM   #23
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Originally Posted by lwmcguire View Post
Maybe a gallon, fitting is on the other end if the wall at the bottom

Yeah if they have two drain (output) lines on one tank, I guess you could argue that using both in tandem can resolve the poor design; which by default ends up being an effective solution Having one drain line with water tank on a slight slope toward the the one drain line (assuming the coach is otherwise level) is all that I have and need. I can see the water in the translucent tank and when it is Empty it is 100% empty.

But my lesson learned for today is that it appears to be or use to be standard practice for RV Mfgs to have both drains; to which I agree with Pete 100%, why? It would be akin to having two drains in the RV shower, because all water may not drain.
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Old 09-25-2021, 06:34 PM   #24
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Brand: Thor Motor Coach
Model: Thor Ace 33.1
State: Illinois
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Originally Posted by Kbro418 View Post
I am trying to drain my fresh water tank, since the drain valve is not at the bottom of the tank there is a considerable amount of water left in the tank. I have tried to use the levelers to angle the water to the drain but still water is left in the tank. I kept all the spigots open to prevent a suction. Is there another valve that I am unaware of?
My 33.1 is like yours the drain is in the back about a half inch up from the bottom. I empty it and drive with the drain open with stainless steel up the drain to keep bugs out but water runs right out. My motorhome doesn't have low point drains. My low point is the outside shower. Do like everyone says drain the water and run pump till empty, blow the lines, drain water heater, run antifreeze through and your done leave the faucets open. Many people here don't use antifreeze, I do because we get 20 below or more weather here. I also remove all my antifreeze out when done, can't freeze what's not there
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Old 09-25-2021, 11:16 PM   #25
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Model: Hurricane 35M
State: New Jersey
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My tank would hold 3/4 inch and mold. I cut in these cleanouts and vac out water to clean then wipe down with bleach
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Old 09-26-2021, 01:19 AM   #26
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Originally Posted by bevedfelker View Post
What model Thor do you have? There is no standardized way Thor has configured their tanks and valves. I find it hard to believe there is no drain in the the bottom of the tank (somewhere).
My Georgetown 2020 Class A and earlier trailers likewise did not have bottom drain. A couple inches of water can freeze in it and not hurt anything.

I agree it is a stupid design. My Arctic Foxes had large bottom drains.
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Old 09-26-2021, 01:24 AM   #27
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Originally Posted by Pete'sMH View Post
Iíve never understood the purpose of having BOTH a tank drain and low point drains. I use the low point almost exclusively to drain my fresh tank and my water heater. Itís faster and easier than the alternatives.
The low point drain is to drain the pipes in the RV. The tank drain is separate. The pump has a check valve at the outlet so nothing drains back through it.
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Old 09-26-2021, 01:41 AM   #28
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Originally Posted by Chateau_Nomad View Post
dk - edumacate me... when you do your "40psi blowout" do you have the pump ON - even briefly? Would that be necessary, or would it depend on how the plumbing is routed? I'm thinking about adding this to my winterize routine.
You should run the pump on air to ensure it is dry.
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