Introducing the Enviro-Safe Stopleak for R12, a reliable solution for stopping leaks in your air conditioning system. The manufacturer part number for this product is 2079. With its vintage part design, this product is perfect for those who want to maintain their car or truck's air conditioning system without compromising on performance. It is compatible with R12 hoses and fittings and is suitable for use in cars and trucks. Get your hands on this practical item today and enjoy a hassle-free driving experience. Aerosol For R12 automotive use The top of the can has a R134a top which means it is a right handed top so you need to make sure you have the correct hose. With age, o rings and seals will shrink and deteriorate. When Enviro-Safe Stop Leak is added to your a/c system, it reconditions the rubber o rings and seals. When the Stop Leak product is installed in an air conditioning system, the product mixes with the refrigerant and oil. As the product circulates in the system, it comes in contact with the o'rings and seals causing them to swell, resulting in "no leak". Stop Leak will not repair or "fix" cuts or worn out o'rings or seals. 1 can will treat 1 vehicle. Installing Enviro-Safe Stop Leak may stop the yearly recharge of lost refrigerant. Use only with Mineral, Ester, and Pag oils. DO NOT use in ammonia systems DO NOT use in CO2 systems Cannot be sent to Alaska or Hawaii or exported to foreign countries except in pallet quantities Gas propelled Installs the same way as refrigerant Cannot be added to a fully charged system Directions for Use: Make sure system is off before connecting to the system. WARNING! CONTENTS UNDER PRESSURE ALL LABELED HAZARDOUS PRECAUTIONS MUST BE OBSERVED. Read and understand all warnings and directions before use. As per use with any flammable substance, take adequate precautions during use. 1. Shake can well. 2. Install can tap valve and charging hose. 3. Install charging hose on low pressure service side ONLY. 4. Start A/C. 5. Invert can. 6. Install all product from can. 7. Fill system with refrigerant to manufacturer's specification pressure. 8. DO NOT overcharge the A/C system. 9. Turn on A/C to circulate Stop Leak. 10. Discard empty can according to all rules and regulations for disposal in your area.