Transporting coolant to build a closed-loop engine cooling system, maintaining a pressure of 100-150kPa to prevent boiling, withstanding temperature differences from -40 ℃ to 120 ℃, and resisting vibration and coolant corrosion. Quality: Made of EPDM material, with a wall thickness of 3-5mm, sealed interface, maintaining a pressure of 200kPa without leakage, and excellent elasticity after aging. Transfer coolant to achieve a "heat absorption heat dissipation" cycle, seal and prevent pressure leakage, and resist cabin temperature vibration and chemical erosion. Quality: Made of EPDM/silicone material, resistant to high temperatures up to 150 ℃, with interface fitting clamps, tested for no cracks or leaks, and strong durability