Clough has a great site there that should help with any questions you have.
A quick list is as follows:
toilet...3 or 4" waste, 2"vent
tub...1.5" waste, 1.5" vent
Shower...2" waste, 1.5" vent
kitchen sink...1.5" waste, 1.5" vent (although most of us are now running 2" waste to kitchen sink).
bathroom sink...1.5" waste, 1.5" vent
washing machine...2" waste, 1.5" vent
Floor drain...2" waste, 1.5" vent
As a minimum, can actually run 1.25" pipe for kitchen sink and bathroom sink vents, etc......but it is never done in the field because just means buying extra fittings and pipes you just don't need.
Can also run a wet vent for entire bathroom if waste is piped correctly....that wet vent needs to be 2" all the way to 2" or larger vent pipe in the house.
Check out clough's links..good pics. (some outdated info. here, too..but generally very good info.).
Hope that helps a little more...
Have good day...MARK
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