| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust air circulating sucker with high performance. SOLUTION: An extension pipe is provided with a freely attachable and detachable connection pipe 20, an inside connection pipe 22 is provided inside the pipe 20, and an outside connection pipe 24 forming a first exhaust channel 23 is provided in the interval with the outer periphery of this inside connection pipe 22. Then, a sucker 25 is linked to the inside connection pipe 22, and a sucker cover 28 is provided to cover the outer peripheral face of this sucker 25.
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