An excellent car watering can needs the following key conditions:

1. Structural stability: The structural design of the watering can should be stable and reliable, and can withstand the pressure and impact inside the system. Reasonable structural design and setting of reinforcing ribs can increase the strength and stability of the watering can and avoid deformation or rupture caused by excessive pressure.

2. Quality reliability: A high-quality automobile watering can needs to undergo strict quality control and testing to ensure that every product meets the design requirements and standards. A reliable watering can can ensure the normal operation of the cooling system and improve the performance and safety of the car.