The O-Ring 25x3.5 is a genuine Stihl part specifically engineered to provide a reliable seal in small engine assemblies and fluid connections. Constructed from high-quality rubber, this O-ring effectively prevents leaks of fuel, oil, and air, ensuring dependable starting and smooth operation of your equipment. With its precise dimensions of 25 mm inner diameter and 3.5 mm cross-section, the O-Ring 25x3.5 fits perfectly into corresponding grooves, maintaining its shape and integrity under pressure. Trust this essential component to enhance the performance and longevity of your Stihl equipment.