Hey there m&m ! Throw away that silly Studor Vent, a real plumber would not need these as we are educated enough to know the proper procedure for island venting, flat venting and the like. Because of the different variables involved I am not going to give you anymore advice. You should definitly get a plumber to do this for you, and depending on your local codes may need approval from the authority having jurisdiction. Good luck
Frank Hiebert
3rd yr apprentice
Edmonton, Alberta