Master stream nozzles can be categorized as:

Master stream nozzles are versatile tools used in firefighting that can be configured to produce either solid or fog streams. This capability allows fire service personnel to adapt their approach based on the specific needs of the situation, such as the type of fire and environmental conditions.

Solid streams are effective for penetrating burning materials and delivering water directly to the seat of the fire, making them ideal for larger fires that require significant water application. On the other hand, fog streams provide a wider dispersal of water and can help with exposure protection as well as cooling the surrounding area, which can be crucial in preventing the fire from spreading.

The ability to utilize both types of streams enhances a fire department's tactical flexibility, allowing personnel to respond effectively to a variety of firefighting scenarios. This dual functionality is what categorizes master stream nozzles as capable of delivering either solid or fog streams, thus enhancing their effectiveness in managing large-scale fire incidents.