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MK4 GOLF 1.8T: Coolant Y flange is especially fit for Mk4 Golf 1.8T 2000-2005. Specifically designed for the Volkswagen Golf Mk4 with the 1.8T turbocharged engine, this Y-flange matches the factory cooling system configuration for a precise, leak-free fit OE 1J0121087E: According to the original factory specifications, the aluminum Y-flange perfectly matches your original car, replaceable OE number, for reference: 1J0121087E. This exact OEM reference ensures you are selecting the correct Y-flange designed specifically for the Mk4 Golf 1.8T cooling system ALUMINUM ALLOY: The coolant Y flange is made of high-quality aluminum alloy material, which is durable and stable. The cast aluminum construction with precision-machined sealing surfaces provides superior durability and heat dissipation compared to factory plastic alternatives that are prone to cracking CAST PERFORMANCE: The cast aluminum Y-flange is professionally manufactured and processed with high reliability, stable performance and long service life. The high-quality casting with smooth internal flow paths ensures unobstructed coolant flow, maintaining proper engine temperature regulation DIRECT REPLACE: The coolant pipe adapter is easy to install, can directly replace for the old or broken one. The Y-flange installs directly onto the existing coolant hoses using factory clamps, allowing you to replace a leaking plastic flange in minutes with basic hand tools