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There are two versions of siphon: The Stack Mount fits a stack opening of 4″ inside Diameter. It also fits to the outside of a 3″ pipe (which measure in at 3.5″ outside), and to the outside of a 2″ pipe (which measure in at 2.5″ outside). The flanged roof mount version seals to a roof, it has a 5.5″ flange diameter.
