Which component is NOT typically found in a water distribution network?

In a water distribution network, components such as valves, pumps, and storage tanks are essential for the system's operation and management. Valves control the flow of water within the pipes, allowing operators to isolate sections for maintenance or manage flow conditions. Pumps are crucial for moving water throughout the distribution system, especially when water needs to be elevated or transported over long distances. Storage tanks are used to maintain a reserve supply of water, ensuring adequate pressure and availability for use during peak demand times or emergencies.

On the other hand, refrigeration units are not part of a standard water distribution system. These units are generally associated with cooling processes in various industrial and commercial applications, not with the distribution and management of water. Thus, they do not serve a function within the water distribution network, making them the correct choice for this question.