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This depends from state to state(or country if you're outside the US). Unfortunately local government legislation differs too much but this should serve as a rough guide.
Refer to local government legislation for datail.
Lavatory needs at least one "S" bend before entering main drainage. All outside piping needs to be at least 2 feet under ground.
Basin, bath and shower drainage can be connected together but needs at least one "s" bend each before connecting to main piping and needs to be at least 2 inch diameter.
"S" bends need to be as close to drainage inlet as possible.
Depending on your region a vacuum break or a vent shall be installed on the main drain.
Refer to diagram
i : sink drain
ii : main drain
iii : vacuum break or vent
Posted on Aug 28, 2010
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Posted on Jan 02, 2017
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