When a cylinder is used to store CO2 in a fixed firefighting system and is retested in accordance with regulations, all flexible connections between cylinders and distribution piping must be renewed or tested at __________.

Correct Answer: Option C — 1000 psi

46 CFR 95.15-10 mandates that all flexible connections between CO2 cylinders and distribution piping must be tested to 1,000 psi upon retesting of the cylinders. This pressure test verifies the structural integrity of the hoses, preventing potential leaks or catastrophic failure during high-pressure discharge of the extinguishing agent.