** Currently there is no FAA approved alternate for R12 refrigerant used in the aviation industry and all R12 system must remain R12. *The only approved alternate for R12 is a product called FRIGIC12, FR12, which is only approved for Military use, exemption R12 alternates, however it is no longer made or available, again FR12 is only approved for "MILITARY USE" in military aviation A/C systems. Professional R12 Refrigerant Recharge A/C kit. For "ALL" R12 A/C & Refrigeration systems made by; Gulf Stream Lear King Air Citation Textron Cessna Beechcraft Boeing Dassualt Bombadier Embraer And ALL other makes that use R12 for the air conditiong system and almost ALL do. **AND ALL OTHERS THAT USE R12 refrigerant!! R12 Recharge A/C Kit (2) Large 28 oz.