A grommet for the 6mm aerator hoses. Made of a special plastic alloy, it is easy to use and durable.
A 4 / 6mm hose adapter. Thanks to this element, it is possible to connect two fragments of a hose into one of a larger length. Its presence in the aeration system is necessary if the pump is of importance away from the tank and the length of the standard hose is insufficient.
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