Cal. Health & Safety Code § 13028

Any person who sells or offers for sale any fire hose, hydrant, fire engine or other equipment with threaded parts, for fire protective purposes, unless it is fitted and equipped with the standard thread for fire hose couplings and hydrant fittings is guilty of a misdemeanor, punishable by a fine of not less than one hundred dollars ($100) nor more than four hundred dollars ($400), or by imprisonment in the county jail for not less than five or more than 30 days, or by both.