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A 25mm GI coupler, as the name suggests, is a connector designed to join two lengths of 25mm galvanized iron pipes together. The 'GI' in its name refers to Galvanization, a process where iron or steel is coated with zinc to provide corrosion resistance. This makes the coupler highly durable and suitable for various environments, especially those with exposure to moisture or harsh weather conditions. Next, you'll want to start the car and turn the AC system to its maximum cooling setting. This will help ensure that the refrigerant is properly distributed throughout the system. With the engine running and the AC on, hold the can of refrigerant upside down and slowly open the valve on the recharge hose