The core function of the radiator water pipe is to transmit coolant, establish the engine cooling cycle, maintain system pressure to prevent leaks, and withstand high and low temperatures, vibration, and corrosion. In terms of quality, EPDM rubber is the primary material, requiring resistance to 150°C high temperatures and 200kPa pressure, with excellent interface sealing. It must pass aging and vibration tests to prevent leakage and cracking.