kitchen sink drain parts
I noticed yesterday that my kitchen sink drain was leaky. I stopped running water last night to give the pipes a chance to dry. This morning at 6 am, I used some tape, but that didn't help. I let it dry again till an hour ago and put pipe dope all over the joints. When I did that, I noticed the metal part directly under the sink is completely falling apart rusted, so I'm calling Mr. Rooter. I wanted to explain what I need, but not sure what that part is called. I looked at a diagram which says it's a strainer sleeve(?) Nothing in the diagram looks like what I have, which is probably original. I have Mr. Rooter's email, so I might send a pic. My husband replaced most of the drain pipes years ago, used PVC. I imagine Mr. Rooter will want to replace all of the drain. I would like to keep that sink, which is prob. original from late 50s. It is stainless stell, and a nice size. I remember my husband had trouble with finding fittings, because of standardization. He did it, though. Mr. Rooter was able to replace the tap and faucets that my husband had added. That was 2 or 3 years ago.
Does anyone know what that part of the drain is called? Thanks!
= new reply since forum marked as read
It sounds like what you’re describing is the strainer. That’s the part that ties the sink to the drain line. Hopefully this diagram helps: 
I feel like it might be the strainer sleeve or tailpiece. It seems like it was bowl shaped and the strainer, what I'd call the neck, that lines the sink drain hole, fit down into it. With all of the rust, I'm not sure what it should look like.
Thanks for adding the diagram. If Mr. Rooter changes all of the pipes, I'm going to see if I can get a cleanout plug. 
