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S traps prohibited-converting to P-trap
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This diagram is completely incorrect!
An S-trap is created by turning the pipe downward before venting it or, having too long of a horizontal run before the line is vented.
The diagrams below may offer some clarification.
Note use of an AAV is a poor substitute for a through the roof vent and may not be legal in all juristictions.
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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