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Diameter of vent pipe needed for toilet?

Code calls for 2'' diameter vent pipe, what would happen if only an 1 and a quarter inch pipe were used ?
Thomas, November 2010
you will often find by not fitting or fitting a 1" or smaller vent pipe that the WC will sometimes syhpon the water out when flushed, unless there is a vent pipe fitted elsewhere in the system, it all depends on the design of the pipe work.
JD

JD, November 2010