Which system may be connected either directly or indirectly to a drainage system?

The correct answer is the water fountain, which can be connected either directly or indirectly to a drainage system. Water fountains often require a drainage system to handle excess water, spills, or drainage from the fountain itself, ensuring that any overflow is directed away from the area to prevent water pooling and potential damage.

Toilets, sinks, and showers typically have direct connections to the drainage system to remove waste and used water. However, while they integrate directly into a plumbing setup, water fountains may not always have a dedicated or direct line to drainage, allowing for alternative methods of managing water drainage, such as relying on overflow systems or indirect connections.

This understanding of plumbing systems is crucial for ensuring proper installation and maintenance practices, highlighting the versatility of how different fixtures interact with drainage systems.