Patent ID: 8733385

Claim:
A cleaner for the inside of a water tank in which water-tank water within the water tank is sucked up by a siphoning action and drained outside the water tank, the cleaner comprising: a suction pipe formed from a linear main body portion and a grip portion connected to the main body portion by a bent connecting part, wherein the linear main body portion has a length that, when used in the water tank, reaches a bottom of the water tank, a flexible water-guiding pipe connected to an outer end of the suction pipe, an upstream-side one-way valve provided at an appropriate place within the main body portion and permitting flow of water only in a direction from the suction pipe to the water-guiding pipe, a downstream-side one-way valve provided within the grip portion and permitting flow of water only in a direction from the suction pipe to the water-guiding pipe, and a suction operation tool provided in the bent connecting part between the linear main body portion and the grip portion and pressurizing or depressurizing an interior of a water passage between the upstream-side one-way valve and the downstream-side one-way valve, wherein the suction operation tool is provided integrally with the suction pipe at a position between the upstream-side one-way valve and the downstream-side one-way valve such that the suction operation tool is provided substantially parallel to the linear main body portion and an operational direction of the suction operation tool is substantially parallel with a central line of the linear main body portion and substantially coincides with a suction direction of water in the linear main body portion.