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Used in car heater pipes or engine coolant systems to ensure smooth distribution of coolant. Internal diameter 3/4 × 5/8 × 3/4 inches (20 × 16 × 20 mm), outer diameter 21 × 17 × 21 mm, suitable for commonly used coolant hoses. Made of heat-resistant engineering plastic, it is resistant to high temperatures, corrosion and wear, ensuring long service life. Precise flow diversion design effectively optimizes coolant flow and maintains normal operation of the engine and heater system. Compatible with standard hoses and requires no additional tools or processing, suitable for DIY or professional installation.