Material and durability: The car windshield washer bottle cap is made of plastic, which is waterproof, resistant to damage and deformation, and designed to provide longlasting protection for your vehicle in harsh environments. It is a reliable and economical choice. Function and benefits: The replacement sealing cap for the washer reservoir helps prevent washer fluid from splashing out of the tank, supporting a smooth driving experience and contributing to longterm, stable performance. Installation: Direct replacement with quick installation. Easy to tighten and can be installed without the help of other complicated tools. Compatibility and ordering: Before ordering, please check the product image style, size, applicable car model and year to ensure you receive the correct replacement part. Use scenarios: DIY maintenance: a worn or cracked cap on the windshield washer reservoir to restore a proper seal and prevent leaks during cleaning cycles. Harsh environments: Use in hot, dusty, or challenging conditions to keep washer fluid contained and the system functioning reliably. Service and fleet use: Ideal for quick, tool replacements in shops or fleet maintenance to minimize downtime and keep vehicles ready.