Dye injector can be used with manifold gauge set or any evacuation or recharging equipment. Has a 2 ounce capacity and 1/4SAE shut-off adapter. This injector may be used to add most air conditioning additive to our system from oil, dye, stop leak, etc. This product is pure liquid refrigerant oil filling tube, fine quality, has a long service life. It is no need to unhitch the refrigerant inside the system (the system does not need in vacuum condition). Suitable for filling up the automobile air conditioning refrigeration system of R134A (need to get help from a fertool), R12, R22. The oilcan can be unscrewed. Refrigeration oil can be filled into the automobile air conditioning. High pressure, oil-resistant, practical, wear-resistant, corrosion-resistant, do not harden. In and out thread size: 1/4SAE Oilcan capacity: 2 ounce Pipe working pressure: 600PSI-3000PSI Total length: 375mm / 14.8ounce Item weight: 277g / 9.8ounce Colour:silver+blue/silver + red Material:Metal Package Contents: 1 x Oil Injector Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.