Rotary 2777 KIT (Includes 2777 Filter and 2797 Pre-Filter) Quality Aftermarket Air Filter Plus Pre Filter Replaces Briggs & Stratton Air Filter Part Number 394018, 394018S, 392642 Pre-Filters Replace Briggs & Stratton 272490, 272490S ID: 5-5/8", OD: 7", Height: 2-1/4"