PROBLEM TO BE SOLVED: To provide a cleaning tool in a water tank, utilizing a siphon action, capable of easily performing the regulation of sucking-up the flow rate of water of the water tank.SOLUTION: The cleaning tool is provided by inserting/holding a flow rate-regulating device B into/to a watering pipe 17 connected with a sucking-up pipe P and capable of contracting or expanding its diameter, pushing the watering pipe 17 to a pipe-bending edge 44e installed at the pipe-holding hole 44 of the flow rate-regulating device B and bending it for squeezing its passage area so as to regulate the flow rate of water flowing in a watering pipe 17.COPYRIGHT: (C)2011,JPO&INPIT【課題】 サイフォン作用を利用した水槽内清掃具において、水槽水の吸上流量の調整を簡単に行うことができる。【解決手段】 吸上パイプPに接続される縮径、拡径可能な導水パイプ17に流量調整具Bを差し込み保持し、この流量調整具Bのパイプ保持孔44に設けたパイプ折曲縁44eに導水パイプ17を押し当てて折り曲げ、その通路面積を絞り、導水パイプ17を流れる水の流量を調整するようにした。【選択図】 図1
