| 摘要 |
In combination, a subterranean liquid storage tank, a pump suction pipe mounted therein and extending substantially vertically from the top of the tank toward the bottom thereof, and a disc member positioned below and in vertical alignment with the lower end of said pipe, the member having a pedestal which rests at the bottom of the storage tank, both the disc and said pedestal being flexible and compressible to a size enabling insertion into and withdrawal from the tank by way of the pipe. Preferably the disc and its supporting member will be made of a flexible foam.
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