The TRANE OEM RNG02087 O RING is a specific type of O-ring designed for use with refrigerant in Trane systems. It has a diameter of 0.734 inches and a thickness of 0.139 inches, making it compatible with Trane equipment. This O-ring is an essential part for maintaining a proper seal in HVAC systems to prevent leaks and ensure efficient operation with refrigerant. TRANE FACTORY SENT O RING IN WRONG BAG. OEM O RING IS IN BAG AND MARKED ON RING