Air Filter, Element/Radial Seal Outer, Length 12 5/16 In, Outside Dia 5 1/32 In, Inside Dia 3 5/32 In, For Use With 2KZU6 Inner Air Element RestrictionsNote: More filters are available on DrillSpot.com . FiltersAirMetal wrapper surface area is 73% open for minimal air flow restriction. PermaPleat design creates built-in pleat spacing and prevents bunching. Radial Seal filters have seal gaskets made of a special urethane compound that will not degrade due to temperature or changes in restriction or vibration.