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07-23-2021, 01:13 PM
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#1
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Established Member
Join Date: Jun 2018
Location: The Great Pacific Northwest
Posts: 40
M.O.C. #21926
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Blue Pex Hanging Down
We have a Blue Pex Pipe hanging down in front of the spare tire?
After 14 years of RV'ing from Alaska to New Mexico, there has been only 3 drains underneath a fifth wheel, 2 at the low point and 1 for the fresh water tank. I need help with this blue one BEFORE crawling underneath in the gravel!!
Something has come loose, it is probably spray expanding foam around the blue pipe and that pipe has a white cap. But again, the blue pex pipe drain, what is it?
This is just embarrassing not knowing or able to find out what it is.
Can anyone chime in?
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Bigrig
2017 Chevy Silverado 2500 HD Diesel
2018 Montana 3811MS
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07-23-2021, 01:45 PM
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#2
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Montana Master
Join Date: Mar 2015
Location: Sequim
Posts: 538
M.O.C. #17176
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Looks like it maybe your fresh tank drain
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Dan & Sandy Huhn
2016 Montana 3720 2015 Chevy 3500 SWD Duro Max
Prev 2012 High Country 313RE 2012 Chevy 2500 DMax
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07-23-2021, 01:48 PM
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#3
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,961
M.O.C. #20477
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Agree with Dan
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Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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07-23-2021, 02:11 PM
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#4
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Established Member
Join Date: Jun 2018
Location: The Great Pacific Northwest
Posts: 40
M.O.C. #21926
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It's not. The fresh water tank has it's own drain and it is located in the rear near the side for easy access. This blue pipe is in the middle in front of the spare tire. I doubt the fresh water tank has 2 drains!
__________________
Bigrig
2017 Chevy Silverado 2500 HD Diesel
2018 Montana 3811MS
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07-23-2021, 02:12 PM
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#5
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,961
M.O.C. #20477
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If you have a residential fridge it may be the drain from it.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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07-23-2021, 02:18 PM
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#6
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Montana Master
Join Date: Sep 2017
Location: Florence
Posts: 961
M.O.C. #20472
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Take the plug cap off and find out what comes out
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2018 Ram 3500 MegaCab 4x4 Aisin, 4:10 Gears
Titan 50 Gal Tank, Air Lift Wireless Bags
2017 3160 RL
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07-23-2021, 02:22 PM
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#7
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,747
M.O.C. #24086
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Do you have a fridge with an ice maker?
Winterizing drain for residential fridge?
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Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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07-23-2021, 02:24 PM
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#8
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Established Member
Join Date: Jun 2018
Location: The Great Pacific Northwest
Posts: 40
M.O.C. #21926
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Do you know of a test to see if it is even hooked up and working? The reason I ask, we had the refrig which is a residential, replaced. Now it is becoming interesting.
Cap has to be next.
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Bigrig
2017 Chevy Silverado 2500 HD Diesel
2018 Montana 3811MS
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07-23-2021, 02:25 PM
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#9
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Established Member
Join Date: Jun 2018
Location: The Great Pacific Northwest
Posts: 40
M.O.C. #21926
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Yes and we live in it full so we have never winterized it.
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Bigrig
2017 Chevy Silverado 2500 HD Diesel
2018 Montana 3811MS
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07-24-2021, 04:55 AM
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#10
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,158
M.O.C. #25165
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On our 3791RD, the ice maker drain line is in front of the tires near center below the island. The fresh tank drain is in the rear behind the tires. This sounds like your ice maker drain line. Our fridge is in the ODS slide just in front of the island. One of the shut off valves is below the sink in the island, so that drain is for the line that runs from the island to the fridge.
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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07-24-2021, 09:12 AM
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#11
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Established Member
Join Date: Jun 2018
Location: The Great Pacific Northwest
Posts: 40
M.O.C. #21926
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Robert, that clears up what it is and I do not expect anything to come out when under there next time I'm on pavement!! Now I know and have added it to the winterization routine IF ever I shut it down for a winter. I'll get some foam and clean things up.
I thank all of you for the help.
__________________
Bigrig
2017 Chevy Silverado 2500 HD Diesel
2018 Montana 3811MS
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07-28-2021, 03:42 PM
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#12
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Established Member
Join Date: Apr 2018
Location: Carnation
Posts: 41
M.O.C. #21668
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It’s a fresh water tank drain. The foam is a weak attempt to seal up the underbelly cover. My foam did the exact same thing before I ripped it off and threw it sways.
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07-29-2021, 05:15 AM
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#13
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,158
M.O.C. #25165
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Quote:
Originally Posted by Bigrig
Robert, that clears up what it is and I do not expect anything to come out when under there next time I'm on pavement!! Now I know and have added it to the winterization routine IF ever I shut it down for a winter. I'll get some foam and clean things up.
I thank all of you for the help.
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When I get a chance, I plan to remove the screw cap on both of mine and put an elbow on and run PEX to the edge of the trailer. I'll put a valve on the end to open/close the drain. I'm going to clean up the spray foam and put pipe wrap on the PEX all the way up into the belly. I may end up using scrim tape on the slit where the PEX enters the coroplast. That should seal it up better and make it easier to drain when I need to without crawling underneath.
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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07-29-2021, 06:25 AM
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#14
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Established Member
Join Date: Apr 2018
Location: Carnation
Posts: 41
M.O.C. #21668
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That’s right. Better yet take the plug off and hook up your fresh water hose set to tank fill. In a minute or two water will come out of the hose and the tank will not fill as long as the plug is off.
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07-29-2021, 08:22 AM
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#15
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Montana Master
Join Date: Oct 2018
Location: Anderson
Posts: 2,633
M.O.C. #22835
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Blue is cold, red is hot, and clear or white is the fresh water tank drain. Fresh water tank drains always have a valve on them to drain. The OP's photo has a cap on the end. It's probably the low point drain for the original residential refrigerator ice maker.
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History is not about the past, it's an explanation of the present.
2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually
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07-29-2021, 08:38 AM
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#16
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Established Member
Join Date: Apr 2018
Location: Carnation
Posts: 41
M.O.C. #21668
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Yeah I’m fine with that. For me (3120rl- 2018) in that exact location and the looks and description of the fitting and cap is exactly where my tank drain is.
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07-29-2021, 10:31 AM
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#17
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,158
M.O.C. #25165
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The only white Pex in mine goes to the black tank flush. On my drain line is blue pex
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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