Patent ID: 8266840

Claim:
A storage unit, comprising: a coupling portion having a circular cross-sectional shape; a storage portion arranged laterally outwardly of the coupling portion, the storage portion having a water storage compartment; and an outlet passage through which water stored in the storage compartment is drained to a first space of the coupling portion, wherein the coupling portion includes a bottom having a drainage hole, a side wall extending upwardly from the bottom, a second space isolated from the first space by a partition wall extending upwardly from the bottom and an inlet passage through which the water is introduced from the second space into the storage compartment, and the storage compartment includes at least two individual storage regions arranged circumferentially around the coupling portion, the individual storage regions communicating with one another through a communication passage so that the water can be introduced from one of the individual storage regions into another, and the coupling portion is further comprising a tubular section having a central passageway, the tubular section formed offset toward the second space from the partition wall, the partition wall is off-centered to make the first space smaller than the second space, extension generally in a horizontal direction to have the first space and the second space arranged one below the other, and the drainage hole formed on the bottom of the coupling portion within the first space in alignment with a center portion of the partition wall.