Professional aeration pumps for large ponds, dams and lakes. Two models are available the PA40 (40 litres per minute) and the PA80 (80 litres per minute). Robust metal casing suitable for outdoor use. Quiet running capability. Excludes air stones and hose. Air Pumps need to be situated outside of the pond above the water line. Cable length 1.8m. 1 year warranty. We recommend replacing air pump diaphrams annually.