The Lawn Boy 110-1751 Lawn Mower Mulch Plug Assembly is a replacement component that helps keep grass clippings circulating beneath the mower deck during mulching operation. It closes the side discharge opening, allowing the mower blade to repeatedly cut grass into smaller pieces before they settle back onto the lawn. The assembly supports the mower's intended mulching function and he... https://www.wholetoolbox.com/lawn-boy-110-1751-lawn-mower-mulch-plug-assembly/110-1751.html