What must a hose be capable of conducting from one end to the other?

A hose used in the context of CNG must be capable of conducting gas from one end to the other. CNG is a specific form of natural gas that has been pressurized for storage and transport, usually in gas-distribution systems or fuel systems for vehicles powered by natural gas.

In this application, the hose is designed specifically to handle the properties of natural gas, including its pressure and flow characteristics. It needs to be constructed from materials that can withstand the high-pressure environment created by compressed natural gas and prevent leaks, as gas leaks can pose significant safety hazards. Additionally, the hose must have the appropriate fittings and seals to maintain a secure connection between components.

While hoses can be used for many different media, in the context of CNG, the primary function is to effectively conduct gas. Other options, such as water or air pressure, do not apply to the specific requirements of a gas transport system, nor do they reflect the purpose for which the hose is primarily designed. Hence, conducting gas is the critical capability that is required in this scenario.