The tie in will be for the washer drainI've used them only twice. Once for a bathroom sink that I tied into the main stack above all other fixture drains, and once to tie a vent line from a basement sink into the vent stack. I'm not sure why they don't make a 4x2 wye saddle. But if your tie-in will be having a goodly flow rate, using a street 45 on the saddle tee and put an easily accessible cleanout in the vertical line above the saddle tee, you should be OK, IMHO.
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