Genuine Daikin 148403J Outdoor Strainer is the mesh strainer in the outdoor refrigerant circuit that catches debris before it can reach and block the valves and capillaries downstream. When it clogs, the unit may lose output, ice up, or stop and start at odd times. A genuine strainer filters the way your Daikin expects, protecting the circuit — where a non-genuine part can flow wrong or shed debris of its own.