| 摘要 |
First and second cylindrical members are fitted into a wiring pass-through hole in a wall board and engaged with each other in accordance with a thickness of the wall board and first and second lid-like members are fitted into openings of the first and second cylindrical members, respectively so as to be able to be removed out of the first and second cylindrical members whereby these cylindrical members are closed. A small quantity of wiring cord or cords pass through small quantity wiring pass-through openings of the first and second lid-like members so as to arrange them in order. By removing the first and second lid-like members out of the first and second cylindrical members, a large quantity of wiring cords are allowed to pass through a large quantity wiring pass-through opening defined by the first and second cylindrical members so as to arrange them in order.
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