Features BETTER SEALING AND LARGER FILTER AREA: The soft gasket brings better sealing and larger filter area, increasing the air intake by 4% FOR 491588S 491588 4915885 399959: Compatible with for 491588s 491588 4915885 399959 push lawn mower, and for bs-4101 5043 5043A 5043D 5043H 5043K INSTALL ON 3.5‑6.5 FOR HP FOR QUANTUM SMALL ENGINE: Can be installed on 3.5‑6.5 for HP for quantum small engine, 625 675 725 625‑675 e/ex series components LOW INITIAL RESISTANCE: Polyester fiber synthesis possess low initial resistance, long service life, can be washed repeatedly EASY TO INSTALL: Air cleaner element replacement is easy to install, possess stable structure and high performance Specification: Item Type: Lawn Mower Air Filter Material: Polyester fiber Package List:1 x Lawn Mower Air Filter Package List 1 x Lawn Mower Air Filter