The MTD OEM190116 Mulching Plug is a genuine OEM accessory designed to convert compatible riding mowers into mulching mowers. When installed, this plug helps to cut and re-cut grass clippings into a fine mulch, returning nutrients to the lawn. It is specifically designed to fit 42-inch and 46-inch mower decks on various MTD brand riding mowers manufactured in 2010 and after, including models from Cub Cadet, Troy-Bilt, Craftsman, MTD, Yard-Man, Yard Machines, Huskee, and Bolens.