I would fill the tub and use Polyseamseal caulk...
Let it dry 24 hours...
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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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