This LEAKFINDER Universal A/C Dye provides precise leak detection on a variety of refrigerants, including R134a and R-1234yf. This bright, fluorescent green dye makes even the smallest leaks easy to detect, helping technicians pinpoint the problem quickly. This dye is formulated to be safe on system lubricants without altering the performance or longevity of air conditioning components. The dye smoothly integrates into your vehicle’s AC system without affecting normal operation, keeping everything functioning properly.