Briggs & Stratton 391483S Oil Seal Replaces 291841/391483 Briggs & Stratton 391483S Genuine Briggs & Stratton Oil Seal For Most 3-4 Gross HP Vertical (PTO End), 450-500 Series Briggs & Stratton Engines Replaces Old Briggs # 391483, 291841, 391483S