Our windshield washer wiper fluid cap is designed to your wornout cap on the cleaning fluid reservoir. It is lightweight, easy to use and weatherproof to prevent leaks. Key benefits Leak prevention: weatherproof cap seals the reservoir to prevent fluid leakage. Easy upgrade: tool replacement that restores seal and protection. Driving stability: special material and process design support stability during driving and improve car controllability. Product features Lightweight, easy to use, and weatherproof for everyday reliability. Replaces worn caps to protect the washer fluid system. Product material Made with a specially designed material and process to ensure stable performance and reliable car control during operation. Installation No tools required. Remove the old cleaning fluid reservoir cap and install this cap on the reservoir. Check that the cap is fully sealed to complete installation. Function Our car radiator cap can effectively keep the inside of the radiator clean and maintain the cleaning effect of the cleaning fluid. Use scenarios Scenario 1: Replacing a worn or cracked washer fluid cap to restore leak operation on the reservoir. Scenario 2: After maintenance or reservoir replacement to ensure proper sealing and cleanliness of the washer system. Scenario 3: In cold or wet weather to prevent leaks and maintain washer fluid performance.