46 CFR 141.385: Line throwing appliance.

Each towing vessel operating in oceans and coastwise service must have a line throwing appliance approved under approval series 160.040.

(a) Stowage. The line throwing appliance and its equipment must be readily accessible for use.

(b) Additional equipment. The line throwing appliance must have:

(1) The equipment on the list provided by the manufacturer with the approved appliance; and

(2) An auxiliary line that:

(i) Is at least 450 meters (1,500 feet) long;

(ii) Has a breaking strength of at least 40 kilonewtons (9,000 pounds-force); and

(iii) Is, if synthetic, of a dark color or certified by the manufacturer to be resistant to deterioration from ultraviolet light.