46 CFR 105.35-15 - Fire hose.
(a) One length of fire hose shall be provided for each fire hydrant required.
(b) Fire hose may be commercial fire hose or equivalent of not over 1 1/2-inch diameter or garden hose of not less than 5/8-inch nominal inside diameter. Hose shall be in one piece not less than 25 feet and not more than 50 feet in length.
(c) If 1 1/2 inch diameter fire hose is used after January 1, 1980, each length of hose must:
(1) Be lined commercial fire hose that conforms to Underwriters' Laboratories, Inc. Standard 19 or Federal Specification ZZ-H-451E. A hose that bears the label of Underwriters' Laboratories, Inc. as lined fire hose is accepted as conforming to this requirement; and
(d) If garden hose is used, it shall be of a good commercial grade constructed of an inner rubber tube, plies of braided cotton reinforcement and an outer rubber cover or of equivalent material, and shall be fitted with a commercial garden hose nozzle of good grade bronze or equivalent metal.
(e) All fittings on fire hose shall be of brass, copper, or other suitable corrosion resistant metal.
(f) A length of fire hose shall be attached to each fire hydrant at all times.