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Precise OE Fitment: The radiator expansion water tank cap is compatible with Vauxhall and Opel, including Corsa D/E (Viva), Astra H/J/K, Insignia A/B, Mokka/Mokka X, Zafira B/C, Meriva B, Adam, Karl, Ampera, and Cascada. It directly replaces OEM numbers 13502353, 13598760, 55566555, 13340476 and 1305248. Note: Please verify your OEM number before ordering to ensure compatibility. Reliable Leak-Free Seal: The coolant tank cap provides a secure seal to prevent coolant leaks and evaporation. Its precision-engineered design maintains optimal cooling system pressure, supporting engine temperature stability and blocking contamination from dust or debris. Effortless Installation: The coolant reservoir cap features a simple push-and-twist fit requiring no drilling or cutting. Complete the replacement in seconds by removing the old cap and securing this new one, saving you time and money on garage visits. Durable Heat-Resistant Build: Crafted from high-quality plastic, the coolant expansion tank cap withstands extreme engine heat and constant pressure cycles without cracking. The sturdy construction prevents loosening over time, ensuring reliable performance for the long term. Cost-Effective OE Replacement: The car radiator cap serves as a direct factory-grade substitute, restoring proper cooling system pressure at a fraction of the dealer cost. It delivers consistent, leak-free sealing as a durable alternative to the original expensive part.