Windridercreations 50 gal Refugium-Sump, Wet/Dry, Aquarium Filter-45x15x15 High-Includes 2 Sock Holders with Socks and bulkheads 45x15x15 High Refugium with two sock kits 3 Baffles - 4 Chambers-- Includes 2 socks and 2 bulkheads Input Chamber - 20 inch for large skimmers and sock option. Refugium Chamber - 18" with a 10" high wall 3rd chamber 4 inch media bubble trap Return Chamber - 6" - Fits most internal pumps