| 摘要 |
A drain/trap to be installed in a basement flooring comprises an assembly cast in metal or molded from a corrosion-resistant synthetic resin includes an upwardly open housing of generally tubular outline, a secondary circuit leading through the bottom wall of the housing and having an inboard extremity opening into the housing interior, and a connecting conduit having a bottom inlet and a lateral outlet communicating with the housing and a lid for the housing. The secondary conduit leading from the ground area beneath the flooring allows the percolation of waters therefrom into the housing for mixture with the drainage waters therein. The trap is of generally U shaped configuration and the inlet end of the secondary conduit is disposed at a fluid level higher than that of the main drain conduit.
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