Product review (5 stars): Stopped the Leak
My dishwasher had a drip coming from the heating element.  When I removed these nuts I found them both to be cracked.  The new ones had to crack or slit and worked great.  When replacing you do not need to use a wrench.  If you have someone press on the heating element and compress the gasket from the top or inside the dishwasher and then just finger tighten these nuts it should be fine.  Using a tool and over tightening can result in these nuts failing prematurely.