What is the fine-grained topic of the following text: At least one 4kg Powder Fire Extinguisher is required for all competitors competing in the JSRA British Jet-Ski Championships this Summer, it must have on it the race number of the race ski it is accompanying or the name of the Freestyle rider and will need to be shown at Technical inspection prior to racing that weekend as it forms part of your essential safety equipment and is required to ensure we conform with the insurance schedule. Only return the topic.
Safety equipment requirements for JSRA British Jet-Ski Championships competitors