| 摘要 |
The debris cap includes a handle activated retainer mechanism for retaining the cap in a pipe in which it is installed. The retainer mechanism includes an over-center connecting rod system for keeping the retaining mechanism in its retaining position. A barrel lock is employed to prevent unauthorized removal of the cap. A resilient flange on the body of the cap frictionally engages the wall of the pipe to support the cap as the retainer mechanism is manipulated.
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