Briggs & Stratton Air Filter Element # 799579.

This foam element air filter provides superior protection against the destructive effects of dirt ingestion. Used on select 550e-550ex Series engines, this OEM part ensures proper fit and performance to maintain the life of your Briggs & Stratton engine.

Rectangular foam element measures approximately 4-1/4" long x 3-1/4" wide x 15/16" height
Fits 550e & 550ex series and may fit other makes and models of lawn mower.
Air filter cover and air filter replaces Briggs & Stratton numbers
Air Filter cover:  595660
Air Filter:  799579
Fits 08P500, 09P600 & 09P700 series engines.