The STIHL 11403500814 Tank Housing is an original equipment manufacturer (OEM) replacement component designed for various STIHL chainsaw models, including the MS 261, MS 271, and MS 291 series. This essential part serves as the primary enclosure for the fuel tank and often integrates with the rear handle assembly. Crafted from durable materials, it provides structural integrity to the chainsaw's fuel system and protects internal components from external elements. Using a genuine STIHL tank housing ensures proper fitment and maintains the operational safety and reliability of the equipment.