🔍 Key Concepts

• Construction of fire hose couplings (male vs female ends) • How impact (like dropping on deck) affects threads and sealing surfaces • Why oil/paint on safety equipment can be a problem on board ships

💭 Think About

• Think about which part of a threaded coupling has exposed threads and could be damaged if it hits a steel deck. • Consider whether adding oil or paint to safety equipment would help or hurt its ability to work quickly and safely in an emergency. • Ask yourself which options sound like good safety practice and which might introduce new hazards on a ship.

✅ Before You Answer

• Identify which end of a coupling (male or female) has exposed threads that could be damaged by impact. • Consider if lubricating with oil is compatible with fire‑fighting water streams and non‑slip handling. • Consider whether painting couplings might hide damage, jam threads, or interfere with quick identification and connection.