A storz self-locking coupling is a type of fire hose connection that features a locking mechanism to ensure a secure and tight seal between hoses. This design eliminates the need for separate locking devices or tools, making it quick and easy to assemble and disassemble. The self-locking mechanism provides added safety by preventing accidental disconnection during high-pressure operations. Storz couplings are commonly used in firefighting and industrial applications where reliable and efficient hose connections are essential. The self-locking feature enhances the overall performance and reliability of the coupling, making it a popular choice for professionals in the field.