Booster Line (Redline) is constructed as which of the following?

• A. 1 inch diameter rubber-covered, rubber-lined, fabric-reinforced hose.
• B. 3/4 inch diameter rubber-coated hose with steel couplings.
• C. 2 inch diameter vinyl-lined hose with fabric jacket.
• D. 1.5 inch diameter canvas-reinforced hose.

Answer: (A)

Booster lines are lightweight, quick-attack hoses designed for fast deployment, so their construction prioritizes a balance of small size, flexibility, and durability. The standard configuration is a 1-inch diameter hose with a rubber-covered exterior and a rubber lining, reinforced with fabric. The rubber lining provides a smooth, watertight inner surface that resists abrasion and kinking, while the rubber cover protects the hose from wear during deployment and use. The fabric reinforcement adds the necessary strength without making the hose too heavy.

The other descriptions describe hoses that don’t match how booster lines are typically built: for example, a 3/4-inch size is smaller and would not carry water as effectively for rapid suppression, and steel couplings would add unnecessary weight and rigidity; a 2-inch vinyl-lined hose uses a different lining material and a larger diameter, not the standard booster line configuration; and a 1.5-inch canvas-reinforced hose relies on canvas rather than rubber for the lining and exterior, making it heavier and less suitable for quick, versatile use.