| 摘要 |
<p>This device comprises a piece of metalwork (1) designed to be cast into a slab (2), this piece having essentially the shape of a funnel the large opening of which is closed by a cover plate (7) having a tube (8) to connect to the upper part (9) of a water drainage pipe and having openings (10) to allow water to drain from the surface of the slab. A tube (3) to connect to the lower part (4) of the water drainage pipe forms part of the funnel-shaped piece (1). <IMAGE></p> |
