Car Radiator Cap, OEM# 16401-31520 16401-20353 Vehicle Radiator Cap Replace, Automotive Replacement Accessories, Compatible with Avalon Sequoia Venza GX470 IS250 IS350

Specifications: Material: steel, anti-oil rubber Color: silver/black/yellow Size: 2.56 x 1.65 x 0.86" Weight: 39.6g/1.4oz Package Include: 1pc Compatible with: 2005-2008 Avalon 2013-2016 Avalon 2000-2005 Echo 2008-2009 Sequoia 2007-2008 Sienna 2004-2008 Solara 1993-1998 Supra 2013-2015 Venza 1992-1993 ES300 2013-2016 ES300h 2007-2016 ES350 1998-2005 GS300 1998-2000 GS400 2001-2003 GS430 2001-2005 IS300 1998-2000 LS400 2001-2006 LS430 2001-2003 RX300 2007-2008 RX350 2016 RX450h 1998-2000 SC300 1998-2000 SC400 2002-2005 SC430

• Premium Material: This automotive radiator cap employs a composite structure of high-performance steel and oil-resistant rubber, delivering exceptional durability, pressure resistance, and long-term reliability for vehicle cooling systems. The steel casing incorporates anti-corrosion design to maintain structural integrity. The oil-resistant rubber gasket withstands engine oil and coolant, forming a tight leak-proof seal between the cap and radiator filler neck.
• Compatible with: Precision dimensions of 2.56 x 1.65 x 0.86 inches, fitting most radiator filler necks and compatible with both open-loop and overflow tank cooling systems. Direct replacement for two original part numbers: 16401-31520 and 16401-20353. Compatible with: 2005-2008 Avalon, 2008-2009 Sequoia, 2013-2016 ES300h, 1998-2000 GS400 and other models. For a complete list, see the Specification section.
• Easy Installation: Installation is straightforward. First, ensure the engine is completely cool. Locate the radiator filler neck and gently unscrew the old cap counterclockwise. Then inspect the filler neck for debris and wipe clean if necessary. Finally, align the new cap's rubber gasket with the filler neck and turn clockwise to secure.
• Pressure Regulation: The core functionality of this radiator cap lies in its dual-valve design, acting as a pressure regulator for the cooling system. It maintains stable internal pressure, with higher pressure elevating the coolant's boiling point to prevent overheating under diverse driving conditions. Should system pressure exceed the cap's rated value, the pressure relief valve opens, diverting excess pressure into the overflow reservoir to safeguard the radiator from damage.
• Packaging Includes: This product is supplied in a bagged package, each containing one premium-quality radiator cap. This single-piece kit is suitable for: motorists replacing leaking, worn, or damaged radiator caps, or performing routine cooling system maintenance. This one-piece cap delivers enduring, reliable performance.