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

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Minimize refrigerant loss during hose connections and disconnections by using fittings that seal automatically. Self-sealing hoses are built with internal valves that close when you disconnect the coupling, so refrigerant can’t vent to the atmosphere. When you connect, the valve opens to allow flow, and when you disconnect, it immediately seals. This makes them the best choice for keeping refrigerant in the system and reducing emissions. Flexible lines or rigid hoses don’t have an automatic seal when disconnected, so they can leak as pressure equalizes. Compression fittings are designed to seal joints in fixed piping, not to prevent venting during quick connect/disconnect, so they don’t provide the low-loss benefit needed here.