Fram, CA77, Round, Heavy Duty, Plastisol Air Filter, 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, Fram, Radial Seal Designs Utilize Urethane That Provides Balance Between Rigid & Soft For A Tighter Seal While Maintaining Ease Of Installation.