This is a Fluidtrol Clear Acrylic Cover with a side vent for SW and RSW 10 Inch Hair and Lint Strainers manufactured in 2015 and after. Design changes to the strainers in 2009 and 2015 warrant different parts. If your strainer is pre-2015, the cover is item 1-100-5105A (center vent).
If you need assistance getting the correct part, please contact customer service.