AEM Dryflow Air Filters are washable synthetic air filters designed for an optimum combination of air flow, filtration, and performance. AEM Dryflow filters use an innovative high performance oil-free filtration material that allows easy cleaning, durable service, and excellent filtration. Flange Inside Diameter: 4.5 in (114 mm) Height: 5.125 in (130 mm) Base: 6.0 in (165 mm) Top: 5.125 in (130 mm)