AC R1234YF R134A Gauge Set, Automotive 4 Valve Manifold Gauge Compatible with R1234YF R134A and R404A Refrigerants, Works on Car Freon Charging and Evacuation. Multifunctional A/C Gauge Set, professional 4 valve automotive air conditioning diagnostic manifold gauge set will compatible with R1234YF R134A R404A refrigerants, perfect for AC freon charging, evacuation, diagnostic check and recovery work.