Upgrade your automotive A/C service capabilities with this professional-grade R134a quick coupler adapter set. The kit includes both high and low side connectors, color-coded in red and blue for easy identification and prevention of cross-connection. Crafted from durable metal with fine workmanship, these adapters feature a 1/4-inch BSP thread (approximately 11mm diameter) and precision-engineered SAE male flare fittings. The knurled grip design provides secure handling during connection and disconnection, while the robust brass construction ensures long-lasting performance under various temperature conditions. These quick-connect couplers are specifically designed for R134a refrigerant systems, making them perfect for automotive air conditioning maintenance and repair work. The secure-fit design helps prevent refrigerant leaks during service operations, while the quick-release mechanism allows for efficient system access. These adapters are essential tools for professional mechanics and DIY enthusiasts working on vehicle A/C systems.