Final answer:
The correct tool for tightening a hard suction hose connection is a spanner wrench, which is specially designed to fit fire hose couplings.
Step-by-step explanation:
The correct tool to tighten a hard suction hose connection is typically a spanner wrench designed for fire hose connections. This specialized wrench helps firefighters secure or loosen the large couplings on hard suction hoses efficiently, which are used to draft water from sources such as hydrants or open bodies of water. The spanner wrench has a specific design where one side of the tool has a prong or a hook to fit into the holes or lug-ears of the hose coupling, making it easier to tighten or loosen without slipping. Additionally, maintaining a firm grip and applying the right amount of torque ensures a secure fit to prevent leaks