*Massive Washable/Reuseable Filter:* With 8-1/2" Base x 8-1/2" Top (Inv) x 11" Height with a 4" flange, this filter is a direct replacement for the popular Donaldson paper filter P/N: ECB085011). Rather than throwing the filter away, you can now wash the filter and reuse it over and over again. *Rounded Open Pleats:* aFe performance air filters use a rounded, evenly spaced pleat design which produces more useable filter surface area for increased flow and greater dust holding capacity. Pleats are 30% taller that the paper alternative. *100% polyurethane construction:* To allow multiple cleaning cycles, the top and base are made of 100% pliable polyurethane that does not deteriorate with time or exposure to heat and chemicals. aFe Power Universal Clamp-on performance filters have a limited 2-year warranty. PartNumber : afe24-50509 Description : OE High Performance Replacement Air Filter Shape : Closed Conical Cap Outside Diameter : N/A Diameter Inside (in.) : 5 Width (in.) : NA Height (in.) : 9 Diameter Outside (in.) : 6.5/4.75 Filter Material : Cotton Gauze Filter Style : Pre-Oiled Overall Length (in.) : NA Air Filters::Air Filters - Universal Fit