| 摘要 |
Inside the top (1) of the housing is a filter unit (10) with filter (12) stretching over a part of the cross-section of the housing top at an angle to the vertical. The filter is placed with its top end in the inner wall area of the housing top and extends down from there into the inside of the top. The filter unit has a filter screen and a water collecting box covered at the top by the filter. This box can be formed by a lower horizontal wall (13) and a vertical wall (14) extending up therefrom.
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