What type of couplings are highly resistant to corrosion?

• A. Brass couplings
• B. Plastic couplings
• C. Cast iron couplings
• D. Steel couplings

Answer: (A)

Brass couplings are highly resistant to corrosion because brass is a copper-zinc alloy that handles moisture and waterborne exposure well. It doesn’t rust like iron-based metals, and it forms a protective surface layer that slows degradation, helping maintain the integrity of threads and seals over time. In firefighting and similar moist environments, this durability is crucial for reliable, leak-free connections. While plastic can resist certain kinds of corrosion, it often doesn’t withstand the mechanical stresses, temperatures, and long-term wear seen in hose couplings as effectively. Cast iron and steel corrode readily in water, leading to rust and weakening joints. So brass offers the best combination of corrosion resistance, strength, and service life for couplings in these conditions.