Radium Engineering Radiator Caps
18-0076-A11
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 (below).
Each OEM replacement radiator cap is manufactured from stamped stainless steel for durability. All 18-0076-X1X radiator caps are electroplated black.
Unlike OEM caps which use natural rubber gaskets, these radiator caps feature premium silicone sealing elements for long lasting durability.
Available with 3 different pressure relief springs:
- 1.1Bar (16.0psi)
- 1.3Bar (18.9psi)
- 1.5Bar (21.8psi)
Radium radiator caps are designed for mini size (32mm ID) radiator necks only. Available in 2 common styles (Type-A and Type-B).
Please confirm what style your application uses prior to ordering. NOTE: As shown below, Radium Engineering coolant expansion tanks require a Type-A style radiator cap.
SPECS
- 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 & 2016-up 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
- 1990-1995 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
- 1989-2002 Nissan Skyline
- 2005-2006 Saab 9-2X
- 1993-up Subaru Impreza
- 1990-up Subaru Legacy
- 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
- 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
- 2008-up Lexus LX570
- 1998-2005 Lexus IS300
- 2012-up Scion FR-S
- 2012-up Subaru BRZ
- 2012-up Toyota 86
- 2008-up Toyota Land Cruiser
- 2008-up Toyota Sequoia
- 1993-2002 Toyota Supra
- 2007-up Toyota Tundra
Review pages below for additional information: