Adjustable Coupler

I'm in my final cut in the pipe 3 "waste Oops! Is rigid, how should I straddle it?
I need a "Y" in it, but the original (to sewers) has zero to left or right or up or down could use a sheet of 3 "pipe. I a piece of flexible rubber tube with alligator clips with screws at both ends, but do not sell a rigid coupler that slides over the top of the pipe 3 "that fits? This seems the ideal solution. I was going to wear a gas mask and gloves, is it really bad to cut down a drainpipe? Thanks. Let me finish my thought … I could marry a piece of pipe from 3 "(inside), but I think things will get hung up on this, right?
Yes they have adjustable pieces to fit the pipe 3 ", if a sewer and drain," ABS ", the hen of the existing pipeline will be black, however, the piece is adjustable white PVC, but still can put the two together just make sure you buy multi-purpose glue and not one for "ABS" or "PVC", so that the rubber part can not recommend it because curode if you use a drain cleaner and do not want chaos below. As for the smell, provided that the pipes up on the roof for ventilation are not blocked you should be OK, sometimes, birds decides to nest there
Stainless Steel Adjustable Coupler Lock – etrailer.com