![]() The drainage header H is composed of a horizontal cylindrical header body 1 having a connecting port 1a for connecting the upstream side drain pipe to an upstream side end surface and having a plurality of connecting ports 1b for connecting the drain branch pipe to both side surfaces or one side surface, and a vortex flow generator 2 having a connecting port 2e for connecting a foundation penetrating drain pipe to a bottom surface, continuously arranged in a downstream side end part of the header body 1 and generating a vortex flow. ![]() SOLUTION: This drainage header H is arranged under the floor of a house. PROBLEM TO BE SOLVED: To provide a drainage header hardly causing sealing water breaking of a trap of a water facility, without generating negative pressure inside the header, a drain branch pipe and an upstream side drain pipe, even if a fairly large quantity of waste water flow in from the water facility.
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