The Briggs & Stratton Replacement Air Filter 30-107 is a versatile solution, designed to fit a wide range of models, including 399806, 399806S, 4138, 491519, and the complete 5048 series. Engineered with precise dimensions (2 5/8" height, 8 1/2" length, and 2 5/8" width), it ensures a perfect fit and optimal performance, delivering consistent airflow to enhance engine efficiency. Crafted from durable, high-quality materials, this air filter provides long-lasting reliability, making it an excellent choice for maintaining your equipment's peak functionality.