HIPA (Pack of 2) 491588 491588S 399959 Air Filter + 271933 491435 493537 Pre Filter for Briggs & Stratton 3.5 to 6 HP Quantum Engine Lawn Mower Pre filter 271933 491435 491435S 493537 493537S Air Filter 491588 491588S 399959 For Briggs & Stratton 112200 12A800-12T899, 128700-129799 and 92200 series 3 to 5 HP horizontal, 3.5 to 6 HP Quantum and 6 HP vertical small engines Qty: 2 x pre filter, 2 x air filter