Second floor shower drain leaking

[Coalie99]

The second floor shower drain started leaking, so I decided to take off the screen and look at it. It did not look like any of the modern drains I’ve seen online as you can see on the picture. I could not find the compression ring and it’s all copper piping and after I cleaned it off the best I could there’s something between the copper pipe and the brass sleeve.Im hoping someone can tell me what it is and how to remove it

 

[Rocknroj]

could be lead packed in.

 

[Sponsor]

 

[Breplum]

You'd have to cut out ceiling from below and observe the exact leak location. If the mounted flange is leaking it might just need tightening with a big channel lock pliers. If the copper tube is lead caulked, and the leak source, a pounding in of the lead could stop a leak. We use "lead" caulking irons /similar to chisel but blunt face.