Circuit Hero high pressure radiator cap uses a 1.3 kgf/cm² spring to increase your coolant/antifreeze boiling point and protect your engine.

An added bonus we've incorporated is the built-in button valve. To ensure there is no hot heat pressure built up, always press the button to make sure there is no hot vapors in your radiator before opening the cap.  Pressing the button also allows hot vapors to escape for quicker cooling. 

*NEVER OPEN RADIATOR CAP WHEN HOT.

FEATURES:

• High pressure spring to raising engine boiling point.
• Safety button to reduce chance of being burned.
• Release hot vapors to cool down engine faster.
  

Type-A APPLICATIONS:

• Fits most aftermarket radiators
• Fits BLOX Racing Radiators
• 1988-1991 Honda Civic
• 1988-1991 Honda CRX
• 1992-2001 Honda Prelude
• 2016+ Honda Civic 1.5T
• 2017+ Honda Civic Type-R
• 1990-1993 Acura Integra
• 2003-2007 Mitsubishi Evolution VIII, IX
• 2008+ Mitsubishi Evolution X
• 2002+ Subaru WRX, STi 

Type-B APPLICATIONS:

• Fits most factory and some aftermarket radiators
• Fits K-Tuned filler necks
• 2007-2008 Honda Fit
• 1992-1995 Honda Civic (all)
• 1992-1997 Honda Del Sol (all)
• 1996-2000 Honda Civic (all)
• 2000-2009 Honda S2000 (all)
• 2002-2005 Honda Civic Si
• 2006-2011 Honda Civic (all)
• 2012-2015 Honda Civic
• 2003-2008 Honda Element
• 1990 -1997 Honda Accord
• 1994-2001 Acura Integra (all)
• 2002-2006 Acura RSX (all)
• 2004-2008 Acura TSX
• 2013+ Toyota 86
• 2013+ Subaru BRZ

* Some aftermarket radiators do not use a factory cap. For example, Koyo uses Type A on most their radiators regardless of application. Please check yours before ordering. 

** Please note our Radiator Caps have extremely tight fit.