What type of master stream device is permanently mounted on a vehicle and plumbed directly into the pump?

The type of master stream device that is permanently mounted on a vehicle and plumbed directly into the pump is known as a deck gun. A deck gun is typically installed on the top of a fire apparatus and is connected to the fire pump and water supply. This allows firefighters to quickly and efficiently deliver large volumes of water to a fire from the apparatus itself, without needing to deploy additional hoses or equipment.

Deck guns are advantageous because they can provide a high flow rate and can be operated remotely, allowing for effective firefighting from a safe distance. The integration of the deck gun directly with the vehicle's pump system ensures that it can be used immediately during fire operations, contributing to a rapid response in emergency situations.

In contrast, a deluge set refers to a specific type of fixed system, while a playpipe and a monitor can be portable or not necessarily mounted directly to a fire apparatus. A monitor, while it can be similar to a deck gun, may not always be permanently mounted and could be used in various configurations depending on the situation.