Which of the following is NOT a location where suds pressure zones exist?

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Suds pressure zones occur in specific locations within plumbing systems, particularly where changes in flow direction and velocity can cause pressure variations. The correct answer indicates a scenario where suds pressure zones do not apply.

In a horizontal drain without fittings, there are no abrupt changes in flow direction or velocity that could lead to the creation of suds pressure zones. The flow tends to remain steady and consistent in such horizontal configurations because fittings and vertical changes are what typically introduce the turbulence that can result in pressure variations.

Conversely, suds pressure zones are likely to form at the base of a soil or waste stack where the flow can change direction and potentially create turbulence. Similarly, offsets greater than 45 degrees can cause changes in flow dynamics that lead to variations in pressure, as can a vent stack connected to a suds pressure zone. Understanding these dynamics helps plumbing designers recognize where suds pressure may impact system performance and design accordingly.

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