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Quick couplings are not only used in hydraulic circuits – several series are compatible with other types of fluids, such as water- and glycol-based fluids, and a number have been designed specifically for non-oil applications. Regardless of the fluid being used, the specs that a quick coupling must include are the same, i.e. ease and speed of connection and disconnection, sealing ability and absence of leaks to ensure optimum levels of efficiency, operation, safety and environmental protection. Special uses of quick couplings include the recharging of air conditioners in the automotive sector.