I'm installing a sink, faucet & garbage disposal. Got the sink in, new shut off valves, faucet installed & working, all fine so far. BUT the new sink's drain hole is in a different position that the old one, basically right above the ABS drain line as it runs under the sink to where it had attached to the old drain (new sink is single bowl, old was double). There is not enough clearance between the drain line & sink bottom to fit the disposal, so I need to re-route the drain line. There's a white ABS stub (it's white, I'm assuming it's ABS. House is about 30 years old) sticking out of the wall about 2-3 inches, not much exposed. Black plastic pipe is glued to this to form the old drain line. Ideally, I would like this old black line to "disappear", leaving the bare stub, to which I would glue a new line routed as I need. I've never dealt with this kind of pipe before. How d I remove the black section from the white stub, leaving the stub as long as possible & ready to receive the new drain? Any tips as to working with this material appreciated!
Thanks
Dan