Where is the upper fixture located in vertical wet venting?

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In vertical wet venting, the upper fixture is positioned above the lower fixture. This configuration allows for effective drainage and ventilation within the plumbing system. When the upper fixture is located higher, it can take advantage of gravity to aid the flow of wastewater down through the system. Additionally, this arrangement facilitates proper venting as the upper fixture can help maintain a water seal in the trap of the lower fixture while allowing air to flow and prevent siphoning.

The design ensures that both fixtures share the same venting system, which efficiently manages air pressure and prevents wastewater from backing up. In vertical wet venting scenarios, it’s crucial that the upper fixture is located above the lower to comply with plumbing codes and ensure optimal functionality. This positioning supports the principle that water flows downhill, which reinforces the rationale for the upper fixture's placement in such a venting setup.

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