Warning: Do not open cap if radiator is hot! Hot fluid can erupt and cause burns.Package Includes: Lid Funnel 45 Degree Elbow x 2 Fluid Stopper 5 inches Straight Extension Large Cap A Medium Cap B Small Cap C Threaded Cap D Large Adapter A with Gasket Medium Adapter B with Gasket Small Adapter C with Gasket Threaded Cap Adapter D with Gasket for GM Threaded Cap Adapter E with Gasket for FordInstruction: 1. First install the correct sized adapter into the correct cap. Place the gasket in a downward position. Tighten the cap with adaptor to make sure it doesn?t leak. 2. If 45° elbow or extension needed, place the funnel after elbow or extension is placed well into the adapter opening. 3. Fill funnel slowly and carefully with coolant about 1/3 full. 4. When run the engine with funnel attached, fluid level should be at low position. Keep RPM on idle position. (Shut down the engine if notice the fluid level rise excessively. Wait for fluid level go lower before restarting the engine.) 5. Use Fluid Stopper for remaining fluid inside the funnel to flow to the radiator hose by squeeze it and release. 6. After finish, remove the funnel ( and or extension/elbow) & adapter, close the radiator with cap tightly.