| 摘要 |
a supporting pipe(2) is installed under the outer cylinder(1) having protrusions(7,7a) in its outer surface; an inner cylinder(3) having plural water inlet holes(11) in its wall is inserted within the outer cylinder(1); a clamp(4) is coupled on the outer surface of inner cylinder(3) to prevent concrete mortar from entering the holes(11); a filtering net(5) which drain passage(13) having plural filtering protrusions(5b) in its side wall is formed in is installed in inner engaging step9); and a cover(6) having plural drain holes(14) and a connecting part(15) is mounted; is disclosed. Thereby, it is possible to quickly drain waste water discharged from washing machine or washbowl and to reduce manhour and costs.
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