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never seen a 4 connection fitting like that. the ones we use are an upright wye. pretty much a wye with a 45 built in that allows for combining the vent from below with the vent on that floor. but it's also reversed for waste from an upper floor to connect to the present floor.
the pipe broke off as i was trying to unscrew it in order to get the galvanized part out and start fresh from the stack. the pipe diameter is 2in with 3in adaptor screwed into the cast iron. i am doing a complete kerdi system which also comes with a non pvc version (stainless steel) drain for places like nyc where pvc is not allowed.
i successfully removed very rusty sink drain fittings from the cast iron stack yesterday. but this one seems to be a different kind of animal.
seeing you don't want to invest in a 2'' pipe tap, you need to be real careful in removing the rotted broken stub
so this is how i do it
carefully scrape out the rusty debris from inside the rusty pipe stub. then you need a sawzall with a fine 24tpi blade. you will slowly cut the inside of the nipple all the way through just to the start of the female threads. do this in 3 locations. they don't need to be 120 degrees apart, but they should be an easy spot to control the blade and saw. try 5:00, 6:00 and 7:00. this will allow you to see what you're doing and then knock out the small wedge you just cut. at this point the remaining 5/6th. of the pipe should literally cave in as you squeeze it with a pair of channel locks. thus freeing the nipple and preserving the good threads
now if this works, you might need to do the same to the remaining threaded bushing.
use plenty of pipe dope and teflon to seal the threads that you might have nicked.
if this sounds too difficult or risky, bring in a good recommended plumber that's got a good reputation in the building
if his name is slyvan lock the doors and don't let him in
Try to help a guy and ya get thrown under the bus.
Lesson: If you want plumbing advice go to the the tile man.
after reading and skimming over 220 post there, you're correct. basically he was refereed here once he damaged his plumbing a couple days ago. otherwise he's been going back and forth on that tile forum for well over a month.
although we did steer him in the same direction, he came here for reassurance of what he had already attempted earlier