🔍 Key Concepts

• Fire hose couplings and how they seal under pressure • The effect of different lubricants and powders on rubber gaskets and hose materials • Difference between dry lubricants vs. oils/greases vs. soaps in marine fire-fighting equipment

💭 Think About

• Which of these substances could cause the rubber gasket or hose material to swell, soften, or deteriorate over time? • Which option is most likely to attract dirt, grit, or cause the swivel to bind instead of rotate freely? • Think about what substance would be specifically warned against in fire-fighting equipment maintenance manuals.

✅ Before You Answer

• Verify which materials are compatible with rubber gaskets typically used in fire hoses. • Consider which substance can trap abrasive particles and damage the swivel and hose over time. • Check standard marine fire-fighting equipment maintenance guidance for what lubricants, if any, are approved on couplings.