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

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

SPECIFICATIONS
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

Compatibility

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

Type-A

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

Type-B

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