| 摘要 |
<p>The inspection point for drains etc. comprises an upper element (2) carrying a cover (3), which is situated at ground level. A base element (4) contains attachment points (9,11) for the drains and is connected to the upper element by intermediate elements (7,8), the number of which depends on the depth of the drains below ground level. Each element is made of semi-rigid plastics material e.g. polyolefine or polyamide. The intermediate elements are shaped like truncated cones and have cooperating edges which secure to one another, or to the upper or base elements, with a seal positioned between.</p> |
