Genuine OEM Toyota Water By-Pass Hose No.4, part number 162810T380. This hose is a component of the engine's water circulation system, specifically designed for by-pass coolant flow. It helps regulate engine temperature by directing coolant through specific passages. Constructed from durable, heat-resistant materials to ensure longevity and prevent leaks. Genuine OEM parts provide the exact fit and material specifications required for optimal engine temperature management and system integrity.