Sorry to not have a picture as I had just returned from celebrating Easter when my sister called me saying her kitchen sink had suddenly overflowed during cleanup - so I rushed back to snake it but without my camera.
Turns out you can't snake a kitchen sink (at least I don't know how) because one side has a garbage disposal while the other side has a built- in "cage" of some sort (which I guess comes apart from underneath).
So, instead of snaking it, I looked for that little trap door on the bottom of the trap curve, but the pipes are all plastic which had no trap door. So I simply unscrewed the J pipe under the sink, only to find 4 inches thick ground up eggshells blocking the water flow. No problem, I thought - but then the real problems showed up when I tried to put it all back together.
The horizontal plastic pipe AFTER the J pipe is supposed to be screwed onto a 1960's vintage steel threaded 1.5" pipe that juts out of the wall only about 1/4".
Turns out that steel horizontal pipe is badly corroded. The plastic pipe after the "J" which fits onto the horizontal pipe has female threads, but the male threads on the steel pipe are gone - so it's only a press fit right now. I see a lot of caulking around it - so I'm assuming it was this way for a while but now it leaks (I didn't have any caulking with me and all the stores were closed today).
So, what I'd like to ask is advice. Again, I apologize for the lack of pictures. I'll snap some tomorrow as I told my sis I'd fix it for her in the morning.
I have no idea, but, I might first need to cut a five inch (or so) hole in the back of the kitchen cabinet plywood with a 4" angle grinder just to SEE what's there so I can get ideas for the repair.
If I see a 1.5" diameter "nipple", I might try to unscrew it - but - I can't imagine what TOOL will unscrew a nipple because there is no room to get a pipe wrench on it since it sticks out so little from the back cabinet wall.
If I can't unscrew the nipple, then I will try to put some kind of compression fitting on it (I guess).
Also, I might look for a "J" trap replacement that has an actual TRAP in it so that we don't have to disassemble it again the next time my sister puts a few dozen egg's worth of eggshells in the disposal unit.
My questions? Q1: How does one SNAKE a kitchen sink? Q2: Do you suggest larger-diameter plastic "J" pipes (with a trap door?)? Q3: What TOOL spins off a 1.5" diameter nipple when only 1/4" sticks out? Q4: Can a compression fitting attach to the corroded 1/4" steel nipple?