40 gal Refugium- Sump -Wet/Dry - Aquarium Filter - 42x15x15 High 42x15x15 High Refugium 3 Baffles - 4 Chambers Input Chamber - 16 inch for large skimmers and sock option. Refugium Chamber - 18" with a 10" high wall 3rd chamber 1.5 inch bubble trap Return Chamber - 6" - Fits most internal pumps