______ ______, self-sealing hoses, or hand valves should be used (as low loss fittings) to minimize refrigerant release when hoses are connected and disconnected.

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Quick couplers are designed to minimize refrigerant loss during connection and disconnection by using internal valves that seal off the flow when the coupling is broken and only open when the two halves are fully mated. This creates a low-loss path, so most of the refrigerant stays in the system and hoses instead of escaping into the air as you attach or remove the service hoses. Self-sealing hoses and hand valves can help, but quick couplers provide the most reliable, built-in shutoff and easy, rapid connections, making them the preferred option for reducing refrigerant release.