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Radium Engineering

Radiator Cap

Choose Cap

Radium high performance radiator caps are engineered to improve cooling efficiency.
The radiator cap is an essential part of an upgraded cooling system and will help to safely
maximize engine performance by controlling the coolant boiling point.
Each OEM replacement radiator cap is manufactured from stamped stainless steel for
durability and feature silicone sealing elements that are superior to natural rubber gaskets.

Available in 3 pressure ratings: 1.1Bar (16.0psi), 1.3Bar (18.9psi), and 1.5Bar (21.8psi).
A higher radiator coolant pressure effectively raises the boiling temperature of the coolant,
providing extra safety margin and preventing air pocket cavitation at the water pump.

Also available in 2 common styles (Type-A and Type-B).
Radium radiator caps are designed for mini size (32mm ID) radiator necks only.
Please confirm what style your radiator uses prior to ordering.

Below are popular vehicles with their respective radiator cap style that is used from the OEM factory.
NOTE: there are many vehicles not listed below that use one of these radiator cap styles.


1990-1993 Acura Integra
1991-2005 Acura NSX

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

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

1992-2000 Lexus SC400

1990-2005 Mazda Miata
2006-up Mazda MX-5
1986-1995 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
2009-up Nissan GT-R
1989-2002 Nissan Silvia
1989-2002 Nissan Skyline

1993-up Subaru Impreza
1990-up Subaru Legacy

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

Radium Coolant Expansion Tank 


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

1994-1997 Honda Accord
1992-2010 Honda Civic
1993-1997 Honda Del Sol 
2003-2011 Honda Element
2007-up Honda Fit 
2000-2009 Honda S2000

2008-up Lexus LX570

2012-up Scion FR-S

2012-up Subaru BRZ

2012-up Toyota 86
2008-up Toyota Land Cruiser
2008-up Toyota Sequoia
2007-up Toyota Tundra

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