Tub drain. Do I have to replace, or can I "fix" this?

[nurse ratchett]

I'm not quite sure, but I think this is brass? It's the underside of my tub. Which I can luckily get to from my basement... Is there a way to fix the brass to brass connection where it's leaking (it's directly on top-not coming from the overflow outlet).. Since I'm an ER nurse, the only plumbing I work on is the human variety.
Anyway, if I have to replace it, it's not the end of the world, but is there a trick to pulling out that brass piece from the (guessing again) ABS?

Thanks you guys, I kind of find this DIY stuff therapeutic. At least it keeps me from hitting anyone back when I'm at work.

 

[Sylvan]

Replace without any doubt .

 

[Sponsor]

 

[hj]

You could replace the leaking pipe but would still have to remove other parts first.

 

[WorthFlorida]

From the picture the leak looks like it is coming from the flange since the mineral deposits is up high. Leaks only flow downhill. However it could be the pipe where it changes size. Brass rarely degrades and I'm suspecting the flange area. There are thousands of youtube videos how to replace a bathtub drain. You may only need a gaskets for the bottom and redo the flange with plumbers putty. It is also a good time to change the drain stopper with new chrome. I do like the toe push button tub stopper type.

 

[Plumber69]

my guess is its coming from the fine threads