here is the link of the correct part you need for model DU8120
https://www.ezvacuum.com/dirt-devil-deluxemvp-brushroll-3820220000-p-2740.html
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here is the link of the correct part you need for model DU8120
https://www.ezvacuum.com/dirt-devil-deluxemvp-brushroll-3820220000-p-2740.html