| 摘要 |
A dripless plunger includes a head connected to a shaft and a cover movable under user control of an actuator on the shaft from a closed position in which the cover overlies the head to prevent drippage from the head after use of the plunger to clear a clogged drain, and an open position in which the cover is moved to a position remote from the head to permit the head to be placed sealingly about the drain and deformed for forcing water through the drain to unclog the same.
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