| 摘要 |
In a water-flushed toilet having a cistern, a fraction of the water inflowing to the cistern is bypassed to a basin, from which it is drained away through a vent. The basin is provided in the lid of a low-level cistern, or in a shelf in the case of a high-level cistern. The bypass consists of a pipe in the inlet to the cistern, feeding through a gooseneck pipe into the basin.
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