GE Nautilus GSD4500 Series Owner's Manual page 16

Caring for the dishwasher.
Two types of
air gaps
Check the air gap any time your
dishwasher isn't draining well.
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Does Your Dishwasher Have an Air Gap?
An air gap protects your dishwasher against water
backing up into it if a drain clogs. The air gap is not a
part of the dishwasher. It is not covered by your
warranty. Not all plumbing codes require air gaps, so
you may not have one.
The air gap is easy to clean.
Turn off the dishwasher and lift off the chrome
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cover.
Unscrew the plastic cap and clean with a toothpick.
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