| 摘要 |
Apparatus for maintaining pressure on a liquid pool cleaning device has an object for attachment to the liquid pool cleaning device, the object having first and second surfaces, the first surface generating a force due to liquid pressure on the first surface causing a downward force on the liquid pool cleaning device in a forward direction of the cleaning device and the second surface generating a force due to liquid pressure on the second surface causing a downward force on the liquid pool cleaning device in a rearward direction of the cleaning device.
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