MSC82834 Coupler Manual High Side R134a 14mm-F x 16mm Quick Features and Benefits: Patented manual couplers adjust easily to R134a service ports with varying dimensions All Metal construction for extra durability Patented, spring loaded depressor will not damage service valves Can be removed from service ports regardless of knob position without losing refrigerant Meets SAE, UL and EPA recommendations for containment of refrigerant Color Coded