Product review (5 stars): Whirlpool Compactor Knob
This product replaced the lost knob on the compactor perfectly.  It was a tremendously reduced price for the same knob the manufacturer recommended.  Would definitely recommend.  This knob was inside the compactor door so the color of the knob didn't matter.  The original one was black and this one was chrome finish.  I probably could have searched for the correct color but it didn't matter to me.