Charles Austen Air Compressors Charles Austen air compressors/Pumps are ideal for sewage treatment systems, Hydroponics, koi pond aeration and aquaculture applications. Other applications include aeration for spa's/whirlpools, rainwater harvesters, cellar emptying, swimming pool emptying, flood prevention and fuel cell manufacture. Charles Austen Air pumps have an oil-free linear diaphragm air compressor/blower. It is very quiet whilst in operation with no vibration. It is supplied in a weatherproof housing with low power consumption.See Model Specs Below ET30 Max Flow 30 Litres per minute Max Pressure: 0.12 bar weight: Dimensions 208 x 150 x 178mm, Connector Size: 14mm, Power:25W.  USE ET30 = 4-6 Pot System ET40 Max Flow 40 Litres per minute Max Pressure: 0.12 bar Weight: Dimensions 208 x 150 x 178mm, Connector Size: 14mm, Power:30W.  USE ET40 = 8-10 Pot System ET60 Max Flow: 60 Litres per minute Max Pressure: 0.17 bar Weight: 6.0 kilograms, Dimensions (LxWxH): 203x165x153mm, Connector Size: 18mm, Power: 55W.:   USE ET60 = 12-16 Pot System ET80 Max Flow: 80 Litres per minute Max Pressure: 0.10 bar Weight: 7.0 kilograms, Dimensions (LxWxH): 210x185x171mm, Connector Size: 18mm Power: 75W:   USE ET80 = 18-21 Pot System ET120 Max Flow: 120 Litres per minute Max Pressure: 0.10 bar Weight: 7.0 kilograms, Dimensions (LxWxH): 210x185x171mm, Connector Size: 18mm Power: 75W:   USE ET120 = 21-28 Pot System

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