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  1. Trent - 2019-08-10 05:49 Quote

    Здравствуйте. The tube well casing houses the inlet, cylinder, piston valves and rising main of a “down-the-hole” type hand pump. Casing to support the external surfaces of the borehole against collapse may be needed, either temporarily or permanently, and is often made of PVC pipe, which is both cheap and inert. Seepage down the tube well bore is prevented by the sanitary seal. Seepage from the ground above the aquifer is excluded by the lengths of plain casing. Water to be pumped is admitted through slots in the lower lengths of casing.
    Взыскание задолженности по расписке – Зайцев и партнеры

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