| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a sparger capable of easily customizing the number or a size of through-holes.SOLUTION: A sparger 50 has: a soft tube 10 having a plurality of through-holes 21; and hard connectors 42, 43 and 44 connected to the soft tube 10. The soft tube 10 has a pair of end parts 10A and 10B and is shaped in a ring shape, and the hard connectors 42, 43 and 44 are provided between the pair of end parts 10A and 10B, and connect the pair of end parts 10A and 10B with each other.</p> |
