To provide devices that can efficiently achieve a liquid-tight state with simple work and can easily collect the liquid in a container as a test sample.SOLUTION: Provided is a device 1 used detachably attached to a container 2 for housing a graft, comprising a lid member 3 for sealing the container, the lid member having a top plate 31 that covers the opening of the container, the top plate having an opening 32 for liquid discharge and an opening 33 for liquid injection, the opening for liquid injection being arranged near the periphery of the top plate.SELECTED DRAWING: Figure 1
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