"ATP" fired this volley in
:

Maybe the drain is threaded like this one:
http://www.handymanhowto.com/wp-cont...6/dsc02570.jpg

Could be, the bottom part has no ridges at all for a wrench, which is
what made me wonder how it was installed. Thanks.

Huh? I suggested that four or five exchanges ago, and you said "no way".

If it's got a cast iron tailpiece, it doesn't _need_ any wrenching flats.

LLoyd