Which of the following is a common characteristic of flex hoses?

Flex hoses are designed to be flexible, allowing them to bend and fit into tight or constrained spaces within electrical and plumbing systems. This flexibility is one of their primary advantages, enabling easier installation and accommodating various layouts without the need for rigid piping.

While it is true that some flex hoses may be made of metal or have high burst pressures, these characteristics are not universally applicable to all flex hoses. The specified requirement for special connectors is also not necessarily a defining feature, as connectors can vary based on the application and type of flex hose. Therefore, the ability to bend and adapt to tight areas is what primarily characterizes flex hoses, making it the most relevant and defining feature among the options provided.