Coolant Reservoir Cap, Engine Coolant Radiator Overflow Tank Cap for 2011-2020 Toyota Sienna, 2010-2015 Lexus RX350, RX450h, Highlander 2014-2019 Replaces OEM 16405-31070 16405-0P040

Ensure your vehicle's cooling system operates correctly with this direct-fit Coolant Reservoir Cap replacement. Designed to meet or exceed OE specifications, it provides a precise seal for models like the Sienna and Lexus RX350/RX450h, matching part numbers 16405-31070 and 16405-0P040. By maintaining proper system pressure, it helps prevent coolant loss and overheating. Made from durable materials to last, its installation requires no tools—just a simple twist-off and twist-on. Keep your engine running cool and efficiently.

• Compatibility with Lexus and Toyota: This coolant reservoir cap is compatible with 2010-2015 Lexus RX350 STD | 6-cylinder 3.5L, and 2010-2015 Lexus RX450h STD | 6-cylinder 3.5L. It is also compatible with 2011-2017 Toyota Sienna LE, SE, STD, XLE | 4-cylinder 2.7L, and 6-cylinder 3.5L.
• Function: This coolant reservoir cap effectively seals the coolant reservoir, preventing coolant leaks and regulating internal pressure to prevent coolant boiling or damage to the cooling system due to excessive pressure.
• High-Quality Material: This engine coolant reservoir cap is made of high-quality materials, ensuring stable operation, resistance to high and low temperatures, and preventing deformation or cracking, thus providing a long service life and effectively protecting the engine's normal operation.
• Replacement Part Numbers: This coolant reservoir cap perfectly replaces original part numbers: 16405-31070; 16405-0P040. Please confirm compatibility with your vehicle before purchasing.
• Easy Installation: The radiator reservoir cap is very easy to install, requiring no tools. Simply replace the old or damaged original part directly.