Optimize your vehicle's cooling system with this Coolant Overflow Reservoir Cap (16405-0P140 / 16405-31100), a perfect-fit replacement compatible with Toyota Highlander 2014-2019 and Lexus RX350, RX450h 2016-2022. Designed for durability and ease, this coolant reservoir cap replacement ensures a leak-free seal for your engine coolant overflow reservoir tank. Crafted from premium plastic and rubber, weighing just 40 grams, it withstands heat and pressure for long-lasting performance. Why choose this product? It delivers OEM-standard quality for Toyota and Lexus owners. Whether you're tackling highway drives or daily commutes, this cap prevents coolant leaks and maintains optimal pressure in your coolant recovery bottle. Installation is a breeze—no tools needed, just snap it into place and get back on the road fast. Key Features: Exact-match coolant overflow cap for Toyota Highlander and Lexus RX models. Lightweight, durable design enhances engine safety. Quick, DIY-friendly coolant reservoir cap replacement. Drive with confidence knowing your coolant system is secure. Ideal for car enthusiasts seeking reliable coolant overflow reservoir caps or engine coolant reservoir tank caps that match factory specs. Order now for a seamless fit and lasting performance!