Hose selection hinges on matching the temperature rating to both the fluid and the environment. The temperature of what’s flowing and the ambient or service temperature determine which materials, reinforcement, and seals can handle the service without softening, cracking, or loss of strength, and they also influence chemical compatibility and pressure capabilities. If the hose is subjected to temperatures outside its rated range, its performance and safety are compromised, regardless of other factors. In practice, you pick a hose whose temperature range covers the fluid’s temperature and the operating environment, and you verify the maximum pressure and chemical compatibility as well. Color is cosmetic and has no bearing on performance. Length matters for routing but isn’t the sole consideration, and a hose’s effectiveness isn’t guaranteed by brand alone without appropriate temperature, pressure, and chemical specifications.