| 摘要 |
An air stone for use in aquariums for aeration of the water contained therein comprising a hollow tube for receiving air under pressure and holes for the discharge of the air. The opposite end of the tube is closed off by a solid portion which is threaded. Adjacent to the tube end for receiving the air is a stop means and a plurality of annular disks which are located on the tube downstream from the stop means. A pair of nuts are employed threaded on the lower end, solid tube portion to compress the disks and thereby controlling the size of the bubbles emanating from between the disks.
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