I am trying to figure out if I can avoid dismantling the existing T-Junction going into the bathroom and installing a new one for the kitchen in that 8" length of pipe, right above the existing junction.
Is this possible/good idea? For example, could I cut out most of that pipe and replace it with stuff like this?
That no-hub coupling says that it works for 1-1/2" or 1-1/4" drain pipe. Does this mean that it can take the existing 1-1/4" drain pipe on one end, and the new 1-1/2" ABS pipe on the other?
It seems that I'd need to fit 2 no-hub couplings and one T-Junction in that 8" length of pipe. Is that likely to work, or is the length insufficient?
EDIT: How much pipe do I need to leave in order for a Fernco coupling to grab it reliably?
Any advice would be greatly appreciated.