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Coolant reservoir cap compatibility compatible with Land Rover and compatible with Jaguar designed for coolant expansion systems to replace a worn cap and help control operating pressure and temperature on daily drives. OEM part numbers LR017427 C2P20325 LR010965 cross reference these to the original cap to confirm fitment before purchase supporting a smooth replacement process and steady cooling system performance. Expansion tank cap function seals the coolant reservoir to reduce evaporation and leaks while maintaining pressure balance rigid plastic housing with fitted gasket supports consistent operation in varied climates. Radiator overflow bottle cap install simple hand twist design enables quick swap with basic tools useful for routine service or when the old cap is cracked swollen or missing to help prevent overheating and coolant loss. Engine cooling system use cases ideal for commuting long trips and light off road driving helps keep the system closed during warm up and traffic supporting stable temperatures in city and highway conditions.