[Fuel Cap 799585] This lawn mower gas cap fits Troy Bilt 200 and 100 mowers with 550EX B&S engine. Compatible with Troy-Bilt, MTD, Yard Machines, Bolens lawn mowers, Toro Timemaster, and Craftsman 580752950 pressure washer. [Compatibility] Replacement part numbers: 799684, 799585, 591003. The 725ex gas cap is compatible with Briggs & Stratton 550E, 550EX, 625E, 675EX, 725EX Series, and Professional Series 7.75-8.75 engines. [High Quality] The 550ex gas cap is made of polyamide plastic. This material offers excellent mechanical properties, heat resistance, chemical resistance, wear resistance, and self-lubrication, enhancing the durability and reliability of the lawn mower. [Easy To Install] The fuel tank cap is easy to install and replace. It is compact, lightweight, and portable, helping prevent fuel cap loss and enabling quick replacement. [Saves You Money] Helps avoid costly repairs or replacements and supports efficient, reliable lawn mower performance. Note: Installation guide not included. Professional installation is recommended. Clear images and measurements are provided when possible. Please verify the item meets your requirements. Material: Plastic Color: Black Package Contents: 1 x Fuel Tank Cap Note: Light reflection and display differences may cause slight color variation between the image and the actual item. Measurement error allowance is +/- 1-3 cm.