| 摘要 |
The drainage siphon (5) of the invention comprises a grooved housing (6) fitted to an exit mouth (8) of the drain (2) and, occasionally, to an additional pipe (10) for drainage, that in the current case rests on a lug (9) in order to leave a free passage. The grooved housing (6) advantageously comprises grooves (11) that are open in their upper part presenting a circular cross-section. If the drain (2) is of the trap type, the groove housing (6) remains located between the mouth (8) and the depressed cavity (12). Thus it permits the drainage of the water collected by the waterproof fabric (13) arranged perimeter to the drainage siphon (5). |
