How to remove plastic strain relief connector?

[lottia]

I'm replacing a bathroom wall-heater. To replace the wall can, I need to extricate the house wiring from the old can, but cannot easily remove the strain relief connector in the knockout. [The type I have is shown at this link: http://www.grainger.com/Grainger/THO...42?Pid=search]

How is this usually done without damaging the house wiring?

Thanks,
Annette

[jadnashua]

There may be an easier way, but I've taken them out by using pliers on the inside...squeeze the locking tabs and jockey it out of the hole.

[lottia]

Thanks. I had figured this out just after posting. :-)