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09-17-2016, 07:24 PM
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#1
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Junior Member
Join Date: Sep 2016
Posts: 11
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2" Grey Tank Plumbing...Problem?
Bought a travel trailer a couple weeks ago, so I'm on a learning curve. Should I be concerned that the gray tank drain begins with a 3" pipe, then immediately becomes a 2" pipe with a 90-degree fitting, and exits the trailer with a fitting that changes the plumbing back to 3" with a standard sewer connection? The manner in which the 2"-3" is plumbed traps a little water in the drain pipe. This water will freeze in the Winter months. I'll try to attach photos to this post.
Is this a standard in the industry...3" to 2"? Why not use a 3" pipe all the way? Wouldn't that flush better? Should I insist that the dealer change out the 2" pipe for a 3" pipe?
Opinions welcome.
Cheers
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09-17-2016, 07:37 PM
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#2
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Senior Member
Join Date: Sep 2012
Posts: 8,055
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Typical, probably not a problem. Assuming you drain the tank as part of winterizing there might be a little water there but it is free to expand upward. Most likely you will dilute it or replace it with antifreeze when you fill the traps.
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09-17-2016, 07:47 PM
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#3
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Not a problem IMHO. Our last three MH's have been this way and never had a problem.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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09-18-2016, 08:21 AM
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#4
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 28,378
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Since the plumbing standard for gray waste lines is only 1.5", I see no problem. However, it seems odd they necked it down to a smaller size for that short distance, when they know a 3" outlet is required for a standard sewer hose connection. Of course, it is equally odd that they put a 3" outlet in the gray tank. At a guess, I suggest that they are using a tank that is also used for black waste in some other model and they decided to build all the tanks with the same size drain port and adapt to whatever model they get installed in. That's the sort of tradeoff that production engineering makes to reduce the number of parts they have to deal with.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is now West Palm Beach, FL
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09-18-2016, 08:27 AM
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#5
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Junior Member
Join Date: Sep 2016
Posts: 11
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Great, I'll not bother the dealer with a non-issue. Thanks
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09-18-2016, 10:10 AM
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#6
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Senior Member
Join Date: Sep 2011
Location: Arkansas
Posts: 2,500
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Massive looking tires on that trailer !!!!
__________________
Monkey, pilot of a Great Dane hauler,
2015 Silverado 2500 Duramax/Alison 4x4 CrewCab 2016 Cougar 28SGS
1ST CAV
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09-19-2016, 09:31 AM
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#7
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 55,705
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No problem! I think our MH has 2" pipe on the gray tank!
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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