12479 – Pre-Filter for Briggs & Stratton® | Replaces B&S® 792303 – Genuine Rotary OEM The Rotary® 12479 pre-filter is a genuine OEM-quality replacement designed for select Briggs & Stratton® engines. Installed over the primary air filter, this pre-filter captures larger debris and contaminants before they reach the main filter, helping extend air filter life and maintain proper engine airflow. Built to meet or exceed OEM specifications, this pre-filter supports reliable engine performance and reduced maintenance intervals. Product Details Manufacturer Part Number: 12479 Brand: Rotary® Part Type: Air Filter Pre-Filter OEM Status: Genuine Rotary replacement part Function Traps dirt and debris before reaching the main air filter Extends primary air filter service life Helps maintain proper airflow Supports consistent engine performance Replaces / Cross-Reference Briggs & Stratton® 792303 John Deere® MIU11517 Compatible Equipment (Common Applications) Commonly used on select Briggs & Stratton® small engines found on: Lawn tractors Zero-turn mowers Walk-behind mowers Outdoor power equipment (Exact engine models vary—always verify OEM part number compatibility before ordering.) ⚠️ Compatibility Note:Pre-filter fitment depends on air cleaner housing and filter style. Always confirm OEM part number 792303 prior to installation. Installation Notes Install over the primary air filter Clean or replace pre-filter as recommended Do not oil unless specified by engine manufacturer Signs a Pre-Filter Should Be Replaced Excessive dirt buildup Reduced airflow Engine running rich or rough Visible damage or deterioration The Rotary® 12479 Pre-Filter is a simple but essential OEM-quality component for protecting your engine and maintaining peak performance.
