| 摘要 |
Gutter drain apparatus for emplacement in concrete decking includes a drainage trough and a cap member adapted to be detachably retained over the open top of the trough. The device is protected from the inward pressure of expanding concrete by grooves formed on the top of side walls of the trough. The cap member has depending latching members each having an inwardly facing bevel. These are adapted to enter the grooves and to slip past and engage outwardly extending lips provided on the inner side of the grooves to detachably latch the cap member on the trough.
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