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Industry standards, such as ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers), provide guidelines for pipe sizing. They recommend calculations based on the cooling capacity of the system, taking into account factors like load, insulation, and local climate conditions. Regularly recharging your car's air conditioning system with R134a refrigerant can help maintain its efficiency and performance. It is recommended to recharge the system every 1-2 years or as needed based on the manufacturer's guidelines. By using a recharge hose designed specifically for R134a refrigerant, you can ensure that the process is safe and effective. The male end of the coupler features an external thread, while the female end has an internal thread, perfectly aligning and securing the connection. The 40mm size indicates the inner diameter of the coupling, which is a standard measurement in many plumbing and engineering applications. This dimension is crucial for maintaining consistent flow rates and compatibility with other system components.