Fire protection regulations for towing vessels allow you to use a nonmetallic flexible hose in fuel line installations under all of the following conditions EXCEPT when ___________ .

Correct Answer: Option A — fitted with Coast Guard approved garden hose fittings

Flexible nonmetallic hoses in marine fuel lines must meet strict construction and installation criteria under 46 CFR, including wire braid reinforcement and visible accessibility. Garden hose fittings are unapproved and prohibited for fuel system installations due to catastrophic failure risks.