Trane Gasket; 9.00 OD X 6.80 ID X 8.10 BC; Refrigerant On - GKT04431. This is a genuine OEM (Original Equipment Manufacturer) part. Use genuine OEM parts for safety reliability and performance. Trane offers a wide array of parts to repair your commercial HVAC units. Find the exact component and attachement you need for your furnace or AC unit..