Fram, CA8737, Heavy Duty, Radial Seal, Air Filter, Outer Offers Extensive Coverage For Both On & Off Highway Applications With Both Traditional & Radial Seal Designs, 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.