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Why don't you post a picture?
We have even less chance of knowing than you.
But with a pic we might know exactly what you are talking about.
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I stayed at a Holiday Inn Express last night.
Now I can Plumb! 
For great information on the history of sanitary sewers including the use of Redwood Pipe
Visit http://www.sewerhistory.org/
Did you know some Redwood Pipe is still in service today.
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