3 in 1 kit: Air stone, 2 metres air line tube, air flow adjuster. Why buy them all separately when you can get this kit Includes: 1 x Air stone (Blue or Black Air Stone) 2m (2 Metre) Air line hose tube standard size 1 Inch cylinder 1 x Air flow adjuster tap plastic Air stones create water movement and improve water circulation from the bottom of the tank to the surface. This helps to oxygenate the water and keeps anaerobic bacteria layers from forming in your substrate. Air stones maintain great water quality and lower your tank maintenance.
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