Compression fitting (Ref. 515).
Mounting steps on a 1 1/4" sink tailpiece.
Comes with 2 washers: 1-1/4" and 1-1/2"
Compression Fitting (Slip Joint Nut) Compression fitting to connect a sink
drain tailpiece to an EasyDrain tube. It comes with 2 washers, one to fit
on a 1 1/2" sink tailpiece and one to fit on a 1 1/4" sink tailpiece.