| 摘要 |
PURPOSE: A threefold strainer is provided to effectively drain water by unblocking holes on an outer cap of the strainer without a separate process to unblock the holes. CONSTITUTION: A threefold strainer includes an outer cap(10), a middle cap(20), an inner cap, and an inner cap hole(31). The outer cap has multiple small holes to pass through water and filter foreign materials. The middle cap is installed in the inner side of the outer cap in the opposite shape of the outer cap. The inner cap is installed in the inner side of the middle cap in the opposite shape of the middle cap. The size of the inner cap hole is capable of passing through the water only.
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