The dremel tool worked well for me, but what ever powertool you use to cut it will also melt the plastic. You must cut out small pieces at a time or the plastic will melt behind the cut and seal it ...
"The Ratcheting PipeLOK Cutters by Superior Tool® are available in three models accommodating 1' and 2” PVC pipe. They are designed to make cutting PVC pipe more precise, quicker, easier and cleaner." ...