| 摘要 |
PROBLEM TO BE SOLVED: To prevent a drain plug arranged for preventing the outflow of valuables from being easily removed from a drain port part. SOLUTION: In this drainage system having a drain metal fitting installed in a kitchen and sanitary space vessel such as a washbowl and a drain catch basin installed in the drain port part of this drain metal fitting and opening plural small hole parts, a fixing part is arranged in the inner peripheral deep part of the drain port part, a string-like member is inserted into the small hole parts opened on a surface of the drain catch basin under surface, and is engaged with the fixing part of the drain port part with the string-like member as an intermediary.
|
