Certification and Standards: Check if the hose meets industry standards and certifications, such as Society of Automotive Engineers (SAE) or International Organization for Standardization (ISO) specifications. Compliance with these standards ensures that the hose meets quality and safety requirements.

As to standard barrier ac hose and reduced barrier ac hose, the inner diameter is same, the different is the outer diameter. Standard barrier ac hose has a bigger outer diameter than reduced barrier ac hose.

Installing air conditioning hoses for buses requires careful attention to ensure efficient cooling performance and system durability. Here are some key points to consider during the installation process: