A partition is required between which of the following?

In plumbing design and installations, partitions serve important functions, particularly concerning privacy and hygiene in restrooms. The requirement for a partition between certain fixtures is based on considerations of use, exposure, and the potential for splashing or other hygiene-related issues.

In the case of a urinal and a lavatory, a partition is essential to ensure that users have privacy while using these fixtures. Given that urinals are typically used in a standing position, and lavatories are usually used while seated or standing close to the sink, having a partition helps to prevent awkward situations and maintain basic privacy standards.

In contrast, the relationship between other fixtures, such as a water closet and a lavatory, does not necessitate a partition under many plumbing codes. This is because the layout usually allows for separate usage without direct conflict. While a partition adds convenience and privacy, particularly for a water closet, the emphasis on partitions often prioritizes situations like that of a urinal beside a lavatory, where behaviors and physical proximity create more significant hygiene concerns.

Thus, the requirement for a partition between a urinal and a lavatory is established in the plumbing code to enhance user privacy and ensure cleanliness in shared restroom spaces.