Flush the cooling system of salts and sediments, which will allow the engine to idle for tuning and engine adjustment in your own driveway. The dual feed engine flusher works great for larger engine's side water intakes. Coated spring steel arms clamp suction cup securely over the engine's side water intakes. Corrosion resistant dicromate finish. Installs in seconds. Use with a standard garden hose. No tools required.