Got that idea from BluDaug. It works nice and looks professional.
Home Depot was about $3.50
UF watertight conduit nut in the side of mine it has a rubber grommet in The middle so your leads don't get chafed. they cost about a buck in the electrical section at the building centers.
It can be seen above the shelf;
Thanks Pap! I will be doing the same. Really like the looks of it. I have mine going thru like a thermal couple adapter and it looks lame. Your method looks nice and beefy. Thanks again...