Driving home around 15 minutes ago and heard something hit the bottom of my car, started to hear something scrapping so i slowed down etc and got the car home safely 
to find this securely stuck to the bottom of my car....


Quick question, What does this plastic thing do, and can i get a new one or should i get try and fill in the hole with some kind of filler?

to find this securely stuck to the bottom of my car....


Quick question, What does this plastic thing do, and can i get a new one or should i get try and fill in the hole with some kind of filler?
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