Great for new or existing ponds and watergardens. Skims the pond of debris before it can settle to the bottom and turn into sludge. Two stage mechanical filtration: houses and protects pump. Snout opening measures 7.5-inch width by 6.25-inch height. Fit for pond size up to 11-feet by 16-feet. Kit Includes: skimmer unit, detachable snout/door, natural cover lid, filter mat, mesh leaf net, stainless screws, screw caps, liner clips, silicone and installation instructions. Measures 22-inch length by 14.5-inch width by 19.5-inch height.