Will cover many skimmers & filters.The usable interior space is:At 1"H - 22"L x 22"WAt 3"H - 22"L x 22"WAt 4"H - 16"L x 12"WWill Fit -Septic Lid: 24" Diameter x up to 3"HWater Garden Skimmer Cover: 24"L x 18"W x 3"HThe Riverbed finish is varigated brown with rich combinations of natural dark tones and multicolor highlights.