What type of test is required for a newly installed plumbing DWV system?

The correct choice is a visual test for a newly installed plumbing DWV (Drain, Waste, and Vent) system because this type of evaluation allows inspectors to assess the integrity and proper installation of the system without introducing any pressure or fluids. During a visual inspection, plumbing professionals can identify issues such as misaligned pipes, inadequate supports, or incorrect fittings that might not be apparent through other testing methods.

In the context of plumbing, a visual test is crucial for ensuring that the system meets code requirements and is free from visible defects. This method is also part of the initial quality assurance process before the system is put into service or covered up by walls or floors.

Alternate testing methods, such as pressure tests, leak tests, or functional tests, while important in various scenarios, are typically employed at different stages of plumbing system evaluation. For instance, pressure tests are commonly used to check for leaks in water supply lines, while functional tests assess whether the system operates correctly during actual use. However, these methods are less suited for the very first assessment of a newly installed DWV system, where visual validation is a key step.