open old plumbing trap

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For scale, the bottom diameter is 3,1" and the "cap" is about 1,35" (just enough for a pair of tweezers to go through?)

yep that's a screw bung. bet ya the threads are galled.

you can see the chisel marks around the rim from previous times unscrewing was attempted.

a pipe wrench won't grip very well on that thin rim of brass. you might end up having to drill holes for a pin wrench. then put a cheater pipe on the pin wrench. then beat on the cheater pipe with a hammer.

brass-on-brass threads are a cunt.

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>>1117876
Get a pipe wrench and a dremel with a cutting disc. Slice off two flat section of the sides of the top of the screw and use the wrench on it.

>>1118101
FYI, a hacksaw will also work to cut those sides flat.

>>1117876
It has threads. I just removed my barrel trap (that's what this is) from my 1912 house. The cap that was on it was new and didn't even fit so I don't know if it was a bitch to unscrew or not.
However from my experience with my plumbing either do this >>1118101 or if you don't want to wreck anything right away, heat the lead around the brass with a propane torch (it can take more heat than you think but not too much) then take you pipe wrench (get a new one with sharp teeth) and try it. Heat does wonders when I was getting pieces apart of my lead plumbing. 2 person job though, one to heat, one to have the pipe wrench on and immediately turn the sucker once heated and torch pulled away

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>>1118070
>>1118101
>>1118620
Thanks a lot! I'm going to give this a try tomorrow.

>>1118620
I've been thinking of getting a propane torch anyway ever since I learned of soldered connections. I'm gonna have to add and replace some piping soon anyway.

Could you take a look at the pipes in my pic? Do you have any idea what kind of material this is and what sort of connection we're looking at? Tin/copper? Soldered connections? I doubt this is is a threaded connection, maybe some kind of male/female join? Sorry I really don't know a lot about this stuff, but I love learning about it.

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>>1120306
Not sure if this is corrosion or the underlying copper.