Looking under a sink a few days ago, I found this….
In our case, and in most cases, you do not need to buy the tailpiece, which is the white pipe. The slip nut can be plastic or in some cases you can use metal as well. (this only applies to the slip nut that attaches to the bottom of the strainer)
Make sure everything is very clean, remove the tailpiece and slip on the new nut, lay the tailpiece washer in place and tighten HAND TIGHT!! Check all your slip nuts under the sink and make sure they are snug then test your water and look for leaks…
If water is coming from above the tailpiece washer….you have a whole ‘nother problem and a whole ‘nother blog!!