A2L refrigerant cylinder adapters differ from standard right-handed thread adapters. Cylinders that contain A2L refrigerants have a left-handed thread on the cylinder and reverse thread adapters are needed to access refrigerant.
JB Industries Adapter, SAE Flare Connection Type, 1/4 in Nominal, For Use With: R454B/R32 Tanks, Additional Information: Large Cylinder, Left-Handed