Ferplast BLU 9021
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Especially designed to be used together with aquarium air pumps Airfizz, aquarium air stones BLU 9020 and BLU 9021 can be easily applied to the aquarium air pumps thanks to the special silicone or PVC tubes through the connection they are equipped with. These air stones have a length of 11.5 or 16.5 cm.