Best Radiator Caps in 2026

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international renown for our diverse range of award-winning products

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Radiator Cap

seal and maintain pressure on the cooling system for vehicle safety

raise the boiling point of the engine coolant to maintain efficiency

fit most models of gm vehicles for expanded coverage

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Genuine Subaru Parts

The Package Length of the Product is 11.0 inches

The Package Width of the Product is 7.0 inches

The Package Height of the Product is 3.0 inches

Maintains proper cooling system pressure

Easy installation and removal

100% tested to ensure proper pressure and longevity

Genuine Motorcraft part that fits your specific vehicle

Radiator Cap

Part Number: RS-527

Direct fit

Package Dimensions: 10.16 L x 7.62 W x 2.54 H (centimetres)

Package Weight: 0.068 kilograms

HIGH QUALITY: The radiator cap is made of premium quality material for long durability and reliability, works on open cooling systems and overflow reservoir type systems, easy installation.

IT'S TIME TO REPLACE RADIATOR CAP: If your radiator cap has following symptoms: air enters the system, overflowing reservoir, overheating engine, low coolant level, coolant leaks, it's time to replace the bad radiator cap.

FUNCTION: Radiator caps are designed to seal the top of the radiator filler neck to hold the coolant inside the radiator and prevent coolant loss, it also works as a two-way valve that keeps the right pressure inside so the radiator does it work correctly. If the pressure isn't maintained, the coolant can boil and evaporate, putting the engine at risk of overheating.

motorad radiator caps are made from high-quality components with proper relief and vacuum valves to meet all oem specifications. these caps are quality tested to stand up to even the most demanding automotive cooling systems.

motorad standard radiator caps make an excellent replacement for worn or faulty radiator caps, which occur over time. radiator caps are easy to install and remove because the caps shell turns interdependent of the sealing gasket, stem, and bottom plate.

motorad radiator pressure caps are designed and made to offer precise pressure control for the automotive cooling system. they are 100 percent tested to ensure the highest quality and longevity.

🚗REPLACES PART NUMBER: 16401-20353，1640120353.

🚗HIGH-PERFORMANCE:100% brand new factory packaging, all materials we use have been tested for performance, reliability and durability.Designed to function on open cooling systems and overflow reservoir type systems and allows the cap to be installed and removed much easier.

🚗COMPATIBLE WITH TOYOTA VEHICLES : 1996-2000 4Runner | 1989-2001 Camry | 1990-1999 Celica | 1993-2016 Corolla | 2006-2007 Highlander | 2003-2013 Matrix | 1992-1998 Paseo | 2004-2009 Prius | 2001-2007 Sequoia | 1999-2001 Solara | 1990-1992 Supra | 1993-1998 T100 | 1991-1998 Tercel | 2000-2006 Tundra radiator cap. Please check the detailed description before purchase. Thank you!

【Replacement】-The radiator caps are designed with a higher pressure rating than OEM caps to raise your coolants boiling point. This reduces boiling over and losing coolant. Equipped on top of the cap is a temperature gauge so you can read how hot or cold your machine is running.Perfectly Match The Old Water Tank Cap And Easy To Replace!

【FIT FOR】 -Honda CR125R CRF250R CRF250X CRF450R XR650R ，kawasaki KLR650 KX250 KX250F KX450 KX450F KX65， Suzuki DR-Z400 DR-Z400S DR-Z400SM RM250 RMZ250 SV650， Yamaha WR400F WR450F YZ400F YZ450F YZ450Z And more vehicles 1.8 high pressure radiator cap.Before Ordering, Please Confirm Whether The Accessories Are Suitable For Your Vehicle To Confirm Compatibility!

【Advantage】- This high-pressure radiator cap will give you real-time temperature monitoring with accurate readings in both Celsius and Fahrenheit (32-400). It has a bright color gradient meter that provides high visibility to assist you in understanding what the temperature of your engine , and can help prevent costly engine overheating！

MotoRad safety lever radiator caps utilize a lever that locks the cap to the filler neck requiring the lever be lifted before removal. When the lever is lifted, the valve pressurizing in the cooling system is opened and pressure is vented through the overflow tube making it safe to remove the radiator cap.

MotoRad radiator caps are manufactured from high-quality components with proper relief and vacuum valves to meet all OEM specifications. These caps are quality tested to stand up to even the most demanding automotive cooling systems.

MotoRad safety lever radiator caps make an excellent replacement for worn or faulty radiator caps, which occur over time. Radiator caps are easy to install and remove because the cap’s shell turns interdependent of the sealing gasket, stem, and bottom plate.

COOLING SYSTEM PRESSURE TESTER: Our radiator cooling system tester kit tests pressure caps and cooling systems for leaks on a variety of vehicles; Radiator pressure tester kit includes (3) popular radiator adapters and (1) cap adapter

FITS MANY VEHICLES: This cooling system pressure tester kit fits most domestic and foreign automobiles and light trucks with large style caps; Works with most common coolant system sizes; Perfect coolant pressure tester kit for any auto tool kit

THE ULTIMATE KIT: The radiator test kit pressure tool features a hand pump and tester head with a 12 inch hose; Coolant tool is equipped with a coolant pressure tester gauge which shows readings in both pounds per square inch and kPA

Brand new polished billet aluminum round 16 LB radiator cap

These are 2-7/8" total diameter

These caps will fit most original radiators as well as all aftermarket aluminum radiators

A faulty radiator cap can cause your car to boil-over at a lower temperature

The SWIV-EL design allows the cap to be installed and removed much easier than conventional radiator caps

Meets Original Equipment specifications

A faulty radiator cap can cause your car to boil-over at a lower temperature

The SWIV-EL design allows the cap to be installed and removed much easier than conventional radiator caps

Meets Original Equipment specifications

OEM Numbers Are Provided for Reference Only. Please Verify Fit Prior To Ordering.

Please Note: Some Listings Use Stock Images for Reference and May Differ from the Actual Product.

This Aftermarket Part Is Made to Meet or Exceed Manufacturer (OEM) Specifications.

Purchase reference ---The car radiator cap replacing OE numbers for reference is 55116901AA.Replacement for Chrysler 1993-2007,replacement for Dodge 1993-2007,replacement for Jeep 1993-2007 .

Function ---Car radiator covers are designed for open cooling systems and overflow reservoir type systems. Safe pressure relief, faster cooling, strong adaptability, excellent stability and durability under all conditions, practical and reliable.

High-quality materials---The car radiator cover is made of high-quality plastic and metal materials. It has the characteristics of sturdiness, durability and stable performance. It has undergone fine surface treatment to ensure reliable performance and longer service life. Our car radiator cover is more reliable and more reliable. Safety is your ideal choice.