Radium Engineering Radiator Caps



The radiator cap is an essential part of an upgraded cooling system. Radium caps are engineered to safely improve cooling efficiency by managing the boiling temperature. A higher radiator pressure effectively raises the coolant boiling point, providing an extra safety margin and preventing air pocket cavitation at the water pump.

NOTE: Traditionally, “radiator” caps are mounted to the radiator but can also be found on coolant expansion tanks

Radium radiator caps are designed for mini size (32mm ID) radiator necks only. Available in 2 common styles (Type-A and Type-B).


Material: Stainless Steel
Sealing Gaskets: Silicone
Pressure: 1.1, 1.3, 1.5 Bar
Design Structure: Type-A, Type-B
Construction: Metal Stamping
Surface Finish: Black Electroplate


Below are popular vehicles with their respective radiator cap style used from the factory. NOTE: there are many vehicles not listed below.


1990-1993 Acura Integra
1991-2005 Acura NSX

1990-1993 Honda Accord
1988-1991 Honda Civic
2016-up Honda Civic
1988-1991 Honda CRX
1992-2001 Honda Prelude

2003-2008 Infiniti G35
2008-2013 Infiniti G37
2014-up Infiniti Q50
2014-up Infiniti Q60

1992-2000 Lexus SC400

1990-1995 Mazda Cosmo
1990-2005 Mazda Miata
2006-up Mazda MX-5
1986-2002 Mazda RX-7
2004-2011 Mazda RX-8

1991-1999 Mitsubishi 3000GT
1990-1999 Mitsubishi Eclipse
2002-up Mitsubishi Lancer/EVO

1989-1998 Nissan 180SX
1989-1998 Nissan 200SX
1989-1998 Nissan 240SX
1990-1996 Nissan 300ZX
2003-2009 Nissan 350Z
2009-up Nissan 370Z
1988-1994 Nissan Cefiro
2005-up Nissan Frontier
2009-up Nissan GT-R
1989-2002 Nissan Laurel
1989-2002 Nissan Silvia
1989-up Nissan Skyline

2005-2006 Saab 9-2X

1997-up Subaru Forester
1993-up Subaru Impreza
1990-up Subaru Legacy
1991-1997 Subaru SVX
2015-up Subaru WRX STi
2015-up Subaru WRX

1982-1995 Toyota Celica
1985-1995 Toyota MR2
1986-1992 Toyota Supra

Radium Coolant Expansion Tank


1994-2001 Acura Integra
2002-2006 Acura RSX
2004-2008 Acura TSX

1998-2016 Chevrolet Tracker
1989-1997 Geo Tracker

1994-1997 Honda Accord
1992-2015 Honda Civic
1993-1997 Honda Del Sol
2003-2011 Honda Element
2007-up Honda Fit
2000-2009 Honda S2000

2005-up Lexus GS350
1998-up Lexus IS300
2005-up Lexus IS350
2008-up Lexus LX570
2015-up Lexus RC350

2012-2016 Scion FR-S

2012-up Subaru BRZ

1989-1999 Suzuki Swift

1996-up Toyota 4Runner
2012-2021 Toyota 86
1989-up Toyota Camry
1993-2017 Toyota Corolla
2003-up Toyota FJ Cruiser
2022-up Toyota GR86
2008-up Toyota Land Cruiser
2008-up Toyota Sequoia
1993-2002 Toyota Supra
1995-up Toyota Tacoma
2007-up Toyota Tundra

Additional information

Weight0.5 kg
Dimensions7.6 × 7.6 × 5.1 cm
Radiator Cap

Type-A, Type-B

Spring Pressure

1.1Bar, 1.3Bar, 1.5Bar


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Models suitable for this product

This product is universal and can be applied for any vehicle

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