| 摘要 |
<p>A method and a device for closing an underground conduit (8) to throughput of particulate or settable material, comprising to place a plug (1) in the conduit (8), the plug (1) being formed from an elastic material (2) with open pores (4) as well as openings (4) of a dimension conducive to fluid, but retentive to the particulate or settable material.</p> |
