The fluval 406 external canister filter provides complete multi stage filtration for aquariums up to 400 litres 100 us gallonsr the modular design allows for quick and easy maintenance while flexible filter media chambers permit maximum versatility for basic to custom filter media configurationsr features include instant priming lift lock clamps that securely lock the cover in place and an aqua stop feature that stops the water flow without the need to disconnect hosesr backed by a 3 ye