The Brackett Aero Filter BA-104 Filter Assembly will protect your engine from ingesting dust or dirt which causes premature piston ring and cylinder wear. These filters contain a specially treated polyurethane element which assures near total protection from foreign material entering the system. Repels water, fire retardant and has good air flow for proper fuel/air ratio. Low-cost maintenance with increased engine life. FAA approved. Brackett Aero filters help prevent frequent engine overhauls! Aircraft operators often upgrade their existing filters to Brackett Aero filters and there after just replace the element part of the filter with a new one at minimum cost. BA-3 Element is for BA-104 Filter Assembly.