Honeywell CA9550 Fram CA9550 Air Filter, Fram, CA9550, Heavy Duty, Radial Seal, Air Filter, Outer Extensive Coverage For Both On & Off Highway Applications With Both Traditional & Radial Seal Designs, Many Have Self Spaced Pleat Technology To Help Eliminate Pleat Bunching & Provide Uniform Pleat Spacing For Even Distribution Of Contaminants & Extended Filter Life, Use High Quality Urethane Gaskets For Better Filter To Housing Seal, Radial Seal Designs Utilize Urethane That Provides Balance Between Rigid & Soft For A Tighter Seal While Maintaining Ease Of Installation.