1. Compatible with: HS46, HS46C, HS56C, HS81R, HS81RC, HS81T, HS81TC, HS86R, HS86T, HT56C, KM56C, KM56RC, FC70, FC70C, FS40, FS40C, FS50, FS50RC, FS56, FS56C, FS56R, FS56C, FS70, FS70R, M 61, M 61C, M 71, M 71C, M 91, M 91C 2. Ensures secure fuel containment: This lawn mower fuel tank cap effectively seals the fuel, preventing leaks during use. It keeps the fuel safely enclosed while mowing, reducing the risk of spills and ensuring a cleaner, safer working environment for your gardening tasks. 3. Promotes stable fuel flow: This replacement fuel cap maintains proper pressure in the fuel system and prevents debris from entering. It supports consistent engine performance by ensuring a steady fuel supply, making your mowing tasks more reliable and efficient. 4. Quick and hassle installation: This lawn mower fuel tank cap offers easy installation and a secure fit. It allows for straightforward replacement of worn or damaged caps, quickly restoring the functionality of your mower's fuel system so you can resume your gardening work without delay.