gravity flow to open drain sump

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Drain-waste-vent system — DWV redirects here. For other uses, see Deformed wing virus. Detail of soil stack, which is connected to the sewer and vented at the top. In modern plumbing, a drain waste vent (or DWV) is part of a system that removes sewage and greywater from a … Wikipedia
Lock (water transport) — Canal lock and lock keeper s cottage on the Aylesbury Arm of the Grand Union Canal at Marsworth in Hertfordshire, England … Wikipedia

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