What appliance is designed to divide one hoseline into two, typically featuring one 2.5 inch and two 1.5 inch outlets?

The appliance designed to divide a single hoseline into two independent lines, typically with one 2.5-inch inlet and two 1.5-inch outlets, is known as a wye. This configuration allows firefighters to effectively split the water flow to serve multiple locations or units simultaneously, enhancing their ability to manage fire suppression efforts efficiently.

Using a wye is particularly advantageous in situations where a larger diameter line carries water and there is a need to supply smaller attack lines for hose teams. It allows for flexibility in deployment, ensuring that multiple crews can operate at different points without needing separate supply lines, thereby maximizing resource utilization during firefighting operations.