A cleaner for an inside of a water tank utilizing siphonage is provided in which the pushing operation of a suction operation tool (A) provided in a bent connection between a main body part (1) and a gripper (2) of a suction pipe (P) causes increase or decrease in pressure of an inside of a water passage (24) between an upstream one-way valve (Vu) and a downstream one-way valve (Vd) so that the tank water in the main body part (1) is sucked up into the suction pipe (P). This enables the waste such as bait remaining in the tank water to be sucked up to the outside with the waste water by a very simple operation.本發明係利用虹吸作用之水槽內清潔器,藉由按壓操作設於吸引管之本體部分與把持部分間之彎曲連接部的吸引操作件,使上游側單向閥與下游側單向閥間之水通路內加壓或減壓,可將本體部分之水槽水吸引至吸引管內。藉此,可以極為簡單的操作,將水槽水內之殘餌等污物與污水一起吸引至外部。1...本體部分2...把持部分2A...水菸管2B...直狀管3...縫隙6...閥體9...閥座體11...閥體15...連接管17...導水管20...操作筒21...按壓扣22...封環23...回動彈簧24...水通路25...操作室A...吸引操作件P...吸引管S...過濾器Vu...上游側單向閥Vd...下游側單向閥
