| CPC E03C 1/29 (2013.01) [E03C 1/281 (2013.01)] | 19 Claims |

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1. A siphon device with a bypass, comprising:
a siphon upper section having
a top coupling means for connecting to a drain outlet,
a side drain opening having coupling means for connecting to a wastewater utility pipe,
a fixed tube having at least one first bypass opening facing the side drain opening, and
a rotatable tube which is concentric with said fixed tube and which comprises at least one second bypass opening,
wherein said siphon upper section is adapted to enable a direct flow via said side drain opening and thereby to bypass a basin of said siphon, thus evacuating substantial volume of accumulated water directly into the wastewater utility pipe;
wherein said siphon can be rotatably shifted from a closed bypass state at which said second bypass opening is blocked by a wall of said rotatable tube, to an open bypass state, by turning said rotatable tube respectively to said fixed tube to an extent at which said at least one second bypass opening overlaps with said at least one first bypass opening, thereby enabling a direct flow of accumulated water into the wastewater utility pipe
in which the rotatable tube is rotated by a shifting knob, coupled with said rotatable tube and protruding outward through a guiding groove through a side wall of the siphon.
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