How to Distinguish Between High and Low Pressure Pipes in Cars?

[LaAllison]

High-pressure pipes and low-pressure pipes can be distinguished by the following methods: 1. High-pressure pipes are thinner: High-pressure pipes have a relatively thinner diameter, usually with red dust covers, and the air nozzle on the pipe has a high-pressure mark "H". High-pressure pipes are generally used for checking air conditioning pressure, and they can also be used to add refrigerant when the air conditioning compressor is not working. 2. Low-pressure pipes are thicker: Low-pressure pipes have a relatively thicker diameter, usually with blue dust covers, and the air nozzle on the pipe has a low-pressure mark "L". It is generally recommended to use low-pressure pipes for adding refrigerant. If adding refrigerant while the air conditioning is on, be sure to turn off the high-pressure switch to prevent accidents, and ensure the refrigerant is in a gaseous state during the process.