Which attack line often uses hoses of various diameters?

The term "wyed lines" refers to an attack line configuration where multiple hoses are connected to a single water supply line using a wye fitting. This allows for the simultaneous operation of multiple attack lines from a single source, effectively enhancing the firefighting strategy by enabling firefighters to address different areas of a fire or multiple fires at once.

Wyed lines may employ hoses of various diameters to accommodate different flow requirements and pressures, depending on the specific needs of the incident. For instance, larger diameter hoses can be used for heavy flows required in more intense fire situations, while smaller hoses might be used for less substantial suppression needs. This versatility allows firefighters to optimize their response based on the dynamics of the fire they are facing.

Other line options, such as supply lines, preconnected lines, and standpipe systems, typically have more standardized setups regarding hose diameter and usage, focusing primarily on specific functions like providing a large volume of water or allowing for immediate deployment without modifications.