2 Pack, Replacement Air Filters Plus Pre-Filters For Briggs & Stratton 394018S, 394018, 392642, 272490S (pre-filter) 2 Quality Aftermarket Air Filters Plus 2 Pre Filters Air Filters Replace Briggs & Stratton 394018S, 394018, 392642 Pre-Filters Replace Briggs & Stratton 272490, 272490S ID: 5-5/8", OD: 7", Height: 2-1/4"