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Old 09-17-2016, 06:24 PM   #1
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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.

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Old 09-17-2016, 06:37 PM   #2
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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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Old 09-17-2016, 06:47 PM   #3
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Not a problem IMHO. Our last three MH's have been this way and never had a problem.
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Old 09-18-2016, 07:21 AM   #4
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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.
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Old 09-18-2016, 07:27 AM   #5
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Great, I'll not bother the dealer with a non-issue. Thanks
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Old 09-18-2016, 09:10 AM   #6
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Massive looking tires on that trailer !!!!
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Old 09-19-2016, 08:31 AM   #7
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No problem! I think our MH has 2" pipe on the gray tank!
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grey tank, plumbing, tank

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