What is the purpose of an 11⁄2" double female connector?

The purpose of an 11⁄2" double female connector is to join two sections of hose that have female couplings. This type of connector is essential in firefighting operations when additional lengths of hose are needed to reach a water source or to extend the hose line to the fire. Since both ends of the connector are female, it allows two hoses, each equipped with a male coupling, to be effectively joined together, ensuring a secure and leak-proof connection that maintains the flow of water as needed during firefighting operations.

The other options, while relevant to firefighting, do not accurately describe the function of a double female connector. Connecting a hose to a tool or sealing the ends of a hose does not require a double female connector, nor does it play a role in increasing flow rate, which is more dependent on the hose diameter and water pressure.