The Lawn Boy 110-1751 Lawn Mower Mulch Plug Assembly helps improve mulching performance for compatible Lawn Boy lawn mowers. It works by sealing the rear discharge opening, keeping grass clippings beneath the mower deck so they can be recut into fine mulch and returned to the lawn. Made to replace a worn, cracked, or missing mulch plug assembly, it helps restore proper grass circulati... https://www.wholetoolbox.com/lawn-boy-110-1751-lawn-mower-mulch-plug-assembly/110-1751.html