Air Filter, Briggs And Stratton; Model: 351400; The K and N E-4665 replacement air filter is constructed with an oil-free synthetic media. A tube of grease is provided in the packaging so that there is an airtight fit in case of severe vibrations. The E-4665 provides superior filtration protecting your equipment's engine. This K and N air filter can be cleaned and used again, lasting the life of your equipment. K and N E-4665 is easy to install and will fit into your factory air box. K and N E-4665 fits some John Deere lawnmowers and some Briggs and Stratton lawnmowers, as well as other applications.