Function: Quick coupling adapter to connect R1234YF to R134a low-side fittings for safe charging and maintenance of car air conditioners. Compatibility: Works with R134a charging hose or manifold, providing flexibility in different charging scenarios. Performance: Delivers stable operation during charging or maintenance with a secure connection for smooth, efficient service. Ease of use: Simple to install by connecting to the R1234YF low-side interface and starting the charging or maintenance process. Design notes: Built for reliable service with robust quick-coupler design to maintain a steady connection during use. Use scenarios: - In a shop, top off or service a R1234YF system using standard R134a charging hoses. - Use with a R134a manifold to diagnose, recharge, or service vehicles equipped with R1234YF systems. - On mobile service jobs where only R134a equipment is available, enabling safe connection to R1234YF low-side ports.