[Bill-n-Brillo]

Originally Posted by VillageSitter

.....Funny though, I just looked at both my sinks in my master bath and neither had a vent and when I looked in my hall bath, that one did. Odd????
Good luck!

A majority of your drain lines will connect direct to a vent pipe that will go out through your roof. Certain situations aren't conducive to having a connection to a through-the-roof vent. Those can have air valve attached that will perform essentially the same function as the roof vent does (allow for proper flow of the drain pipes, etc.) - but they don't allow odors to escape into the house.

Bill