Side Rail Channels - Chevrolet 2006 Avalanche Owner's Manual

To replace the drain grate do the following:
1. Line up the clips on the vehicle with the slots in
the grate.
2. When you are sure that the clips are aligned with
the slots, push the grate down firmly.
The grate should clip into place. Do not force the grate
if it will not clip into place; realign the clips with the
holes and try again.
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Side Rail Channels

The side rail channels are located on top of both sides
of the cargo area. Flush them out with clean water
debris collects inside of them.
When loading cargo into the cargo area, be careful not
to damage the rails.