Product review (5 stars): Waste King - Perfect Replacement
The "portal of doom" to our Waste King was plain nasty. The local hardware store's "universal fit" replacement was anything but universal.  The Waste King has a somewhat smaller opening than the more popular (apparently) InSinkErator brand disposers.

This was the perfect fit for or household Waste King disposer. We simply removed the old part but pulling it up and out of the drain hole and snapped the replacement in. The rubber is on the stiff side, so prepare to do a bit more coaxing to get stuff down the drain.