Kitchen drain installation

[X_Digger]

6. Ahhh, gotcha.. I misunderstood.

Yeah, the reducing adapter from 1-1/2" to 1-1/4" can be a source of clogs. If it were me, I'd use a 1-1/2" tailpiece / p-trap into the wall bushing in a perfect world (or a reducing adapter lower down the tailpiece.

As to the leaking, has the nut that holds the tailpiece on been cross-threaded? Any threads goobered up on the sink trap piece?

Usually you only have to go hand tight with those plastic tailpieces.

You might want to try some teflon paste, rather than tape- it seems to work better for me. And don't over-tighten.

eta: You likely don't need that little adapter between the sink basket and the tailpiece. It's usually used for bar sinks where you have a smaller drain.