This 1 liquid oil coolant auto refill allows for easy and fast automatic refilling of your vehicle's air conditioning. The is equipped with a 1/4 inch internal thread connector, which is directly to 1/4inch external thread port. If you are using a with different port sizes, you may need an adapter to complete the job. Whether you have basic automotive knowledge or not, this is user friendly and enables you to maintain and troubleshoot your vehicle's air conditioning with ease. Perfect for automotive repair shops and garages, this simplifies of maintaining and troubleshooting air conditioning , improving efficiency and accuracy. Package includes: 1Set Oil Dye