R12 AC Oil Dye Injector R134A R12 2oz A/C Air Conditioning Injection ToolFeature: 1: R12 AC Oil dye injector for R134A R12 2oz A C air conditioning system. 2: 1 4" SAE Male x 1 4" SAE Female, 600PSI 3000PSI. 3: A needle style valve attached between the manifold gauge set or charging equipment and A C hose. An excellent tool to add refrigerating oil or a large amount of UV leak detection dye to the air conditioning system. 4: Use Set Up After emptying, suck in the oil by a vacuum method, or use injector to add 2 oz oil to a