Ok Frank,
I think I see a way out for you that doesn't involve rubber couplings, ( I don't like rubber couplings under ground. They aren't ridged enough and will bell under the weight of the ground cover and the cement patch).
Let's try it this way. You have a 3X3X1 1/2" street wye glued into a 3" wye.
Take a Saws-All, (reciprocating saw) and make a straight cut next to the base of the 1 1/2" branch. That will give you enough room for a 3" no-Hub clamp, (see image). Now place a 3X3X2" street wye next to the piece coming out of the 3" street wye and make a mark on your pipe where the bottom of the 3x3x2 wyes hub sets. Cut the pipe off a 1/4" short of the mark you made. Prime what going to be glued. You may now place the No-Hub clamp in place and glue the 3X3X2 wye in place making sure that you give the 2" branch a little slope. Tighten the No-Hub bands and this puts you back in business. Good luck, Tom
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