The STIHL 11286403000 Pump Housing is a genuine OEM replacement part designed for various STIHL chainsaw models. This essential component ensures proper oil pump function, critical for lubricating the bar and chain during operation. It is compatible with STIHL MS 440, MS 460, MS 650, and MS 660 series chainsaws, including R variants. Manufactured to STIHL's rigorous quality standards, this pump housing provides reliable performance and a precise fit, maintaining the integrity and efficiency of your equipment.