Answer: -My house has one for the kitchen sink and it works just fine. No way to vent that traditionally since it is on the outside of a solid log wall house. -Not ideal either. Doesn't extend above the water level attainable in the sink and would have required another 20' run of vent pipe, clean-out, etc. See: http://www.thisoldhouse.com/toh/tvprograms/asktoh/qaarticle/0,16588,2...