The FJC 6804 High Side Dual Manual Couplers are precision-engineered fittings designed for servicing R-1234yf automotive air conditioning systems. These couplers feature a 14mm connection and manual shut-off valves, allowing technicians to securely connect to the high side of A/C systems with full control over refrigerant flow. Built for durability and ease of use, they are ideal for professional-grade manifold gauge sets and service equipment. Whether you're evacuating, charging, or diagnosing, these couplers deliver reliable performance and leak-free operation