Replacement Cartridge Filters EO4388 Environmental. Replacement Element for Part Number Environmental EO4388 Filter. 12.75" x 30" L 80/20 Blended sq ft media. Environmental is a registered trademark of the respective company. TDSF-10002213 Replacement Cartridge Filters EO4388 Environmental.Our Replacement filters Work As Good Or The Same As The OEM Filters. We guarantee their performance. Some of the filters are non stock items and cannot be returned. Please see our return policy.