The HONGTECH A/C Recycling Machine has made servicing and repair to A/C systems quick and easy. It recovers, recycles, evacuates, leak tests, and recharges refrigerant quickly and accurately. This machine can be easily adapted to work with the new R1234yf gas that is coming onto the market this year. With the new Nitrogen leak test function, operators can quickly find A/C system leaks. It is now illegal to use refrigerant for leak testing. It also means no more messy dyes or time wasting.