Bathroom Sink Drain Replacement Help

[billelliottjr]

Hello,
I recently tried replacing my bathroom sink drain because it got backed up and then I tried cleaning it up it was falling apart. No matter what I do, when I am hook the new drain tail (1.25") into the existing P trap apparatus (1.5"), it starts leaking. Any ideas what I'm doing wrong? I did try replacing the ring that is supposed to convert the sizing according to the guy at the hardware store.

 

[Geofd]

Could be a few things but there are (slip nut) washers that under those nuts,3 of them

 

[billelliottjr]

Could be a few things but there are (slip nut) washers that under those nuts,3 of them

Thanks, the leak is actually occurring where the gray pipe joins with the white

 

[Twowaxhack]

Thanks, the leak is actually occurring where the gray pipe joins with the white

There’s suppose to be a step down reducing washer there. 1.25” x 1.5”.

Use some silicone on each side of it as pipe dope and hand tighten it.