| 摘要 |
<p>Non-return closure for sewer system ducts, that comprises a tubular body (1) of cylindrical general section, finished at one of its ends in a length of square seccion (2) that terminates in an oblique open base (3), on which is monted a cover (4) that is hinged to the innermost non oblique edge (6), in accordance with an axis parallel to said edge, the cover of which covers the whole open base and is provided with lateral skirts (7) that abut on the outside, in the closed position, against the adjacent walls. <IMAGE></p> |
