I have 3" PVC for my main drain line and need to cut out a vertical section of it to add a sanitary tee for a water softener drain. I can glue the tee fitting on one end easily but I won't be able to fit and glue the other end at the same time because the pipe is fixed. What is the best way to couple the hub end of the tee fitting with pipe? I haven't seen a coupling that works for both a hub end and pipe end. Should I glue a small stub of pipe into the 2nd end of the fitting and then just use a standard repair (slip x slip) coupling? Any suggestions with using either rubber compression (Fernco) type couplings vs. regular PVC types in this situation?