Lennox First Choice Bi-Directional Flow Liquid Line Filter Drier, 16 cu. in. with 3/8" x 3/8" ODF Connections for 1 to 5 Ton Heat Pump Applications 40 micron filtration ODF solid copper connections for easy install Dessiccant blend optimized for high water and acid capacity Solid core construction Corrosion resistant epoxy powder paint finish