The Lagros LA5375 is a high-quality aftermarket air filter designed as a direct replacement for the OEM Briggs & Stratton part number 399806. This filter is engineered to provide superior engine protection by effectively capturing dust and debris, maintaining clean air intake for various Briggs & Stratton 10-13 HP vertical and 12.5-17 HP I/C AVS horizontal engines. It fits numerous Briggs & Stratton engine series including 100200, 130200, 170400, 190400, 220400, 250400, 280700, and 310700 series models. With an outer diameter of 95 mm, an inner diameter of 51 mm, and a height of 51 mm, it ensures a precise fit and reliable filtration.