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4mm airline is commonly used on smaller air stones, such as the 50mm ceramic balls, and the smaller ceramic cylinder air stones.
8mm is for use on aerated bottom drains, and larger flat ceramic air stones and larger Japanese ceramics such as the CE6 and CE7.
Air line sizes are formatted at INTERNAL DIAMETER X EXTERNAL DIAMETER
Air stone sizes are formatted as LENGTH X DIAMETER X AIRLINE SIZE

4mm x 6mm Clear Airline - 30m
Our Price: £8.45

8mm x 11mm Clear Airline - 30m
Our Price: £18.95

8mm x 13mm Black Reinforced Airline - 30m
Our Price: £23.50