The advanced TetraTec APS 400 Air pump is for use with all aquaria from 250 to 600 litres in size. With the external flow control valves included, the TetraTec APS 400 can be easily adjusted to provide the right air flow for all purposes like box filters, airstones, action ornaments and undergravel filters. Innovative design reduces noise while producing high flow. The external flow control valves are included. Exeptional quality and reliability giving a 3 year guarantee.Technical data TetraTec APS 400:+ high flow due to powerful long-lasting diaphragm+ very quiet due to noise supression chambers that absorb sound waves+ very quiet operation due to innovative construction of pump, strong housing walls and special rubber feet, which absorb vibration+ pump output: max: 400 l/h+ power consumption: 4,5 W 230 V/50 Hz+ for aquaria from 250 to 600 l+ number of outputs: 2+ usual Version in grey+ NEW: White Edition