On Tue, 01 Nov 2016 12:25:20 -0400, Don Wiss
wrote:

On Tue, 01 Nov 2016 11:48:36 -0400, wrote:

There are pressure solutions but I would remove the trap before I did
it if it is that thin plastic compression stuff.

This is the trap: http://donwiss.com/pictures/misc/S-trap.jpg

I don't follow about the thin compression stuff.

Don. www.donwiss.com (e-mail link at home page bottom).

These days that trap would all be thin wall plastic. Do you have a
compressor? You could use water pressure but that could get messy.
I would try to make an adapter that connects to the trap (disconnected
from the tail piece from the sink) and see if you can blow the clog on
down the line. That galvanized will tolerate the pressure and once it
gets to the cast iron it should go away. If you go that way, it is
good you have not used any drain cleaner because it may come back at
you.