Why do my stoves other own an eye that the grill comes through from the oven? What is the purpose of that? Is it ok if...

What is the purpose of that? Is it ok if I cover the eye up with a pot lid to stop the boil from coming out?
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Answers:    If it's a gas oven, the 'eye' is needed to allow oxygen into the oven as a flame can't be sustained in the malingering of oxygen. Don't cover it up.
Where can i find an attachment for a...