SD20020 takes F77. You can find it here: https://www.ezvacuum.com/royal-dirt-devil-f77-f-77-stick-vac-filter-440003993-genuine.html
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SD20020 takes F77. You can find it here: https://www.ezvacuum.com/royal-dirt-devil-f77-f-77-stick-vac-filter-440003993-genuine.html