OASE 57395 Aquaskim 40" Pond Skimmer, Black Effective pond surface: 270 sq. Ft Installation depth: 8 - 22 in Max. Water level variation: up to 6 in Recommended pump capacity: 1600 to 3500 GPH Tubing connector: 1 in., 1 1/4 in., 1 1/2 in