It consists of an inlet gutter (1) which presents a catch basin (2) in its bottom in the central position, divided into three bodies by means of two partitions (3), with the central body presenting a horizontal outlet (4). A drain trap cover (5) fits into the catch basin (2), and presents two skirtings (6) which are introduced intro the lateral bodies without reaching the bottom thereof and which are kept separated thanks to individual tabs (7). Arranged on the inlet gutter (1) is a frame (9) provided with a flange (10), on which rests a grille (11) with a cross-section in "U". Optionally, a conventional aeration valve (12) is provided on the drain trap cover (5). The water circulating through the inlet gutter in opposite directions towards the lateral bodies of the catch basin (2) undergoes an acceleration which facilitates its discharge through the drain trap.
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