Radium Radiator Cap Type A — Black Note: Check your radiator cap type before purchasing — Type A and Type B are not interchangeable. Refer to the product images for a comparison. Radium high-performance radiator caps are engineered to improve cooling efficiency and safely maximise engine performance by controlling the coolant boiling point. Each cap is manufactured from stamped stainless steel with silicone sealing elements — superior to the natural rubber gaskets found in OEM caps. Designed for mini-size (32mm ID) radiator necks only. Available in three pressure ratings: 1.1 Bar (16.0 PSI), 1.3 Bar (18.9 PSI), and 1.5 Bar (21.8 PSI). A higher pressure rating effectively raises the coolant boiling point, providing an extra safety margin and preventing air pocket cavitation at the water pump. Suits: Mini-size (32mm ID) Type A radiator necks — see fitment table below. Many vehicles not listed may also use this cap style. Available Part Numbers: Part Number Pressure Rating 18-0076-A11 1.1 Bar (16.0 PSI) 18-0076-A13 1.3 Bar (18.9 PSI) 18-0076-A15 1.5 Bar (21.8 PSI) Type A Vehicle Fitment Guide: Make Model Years Honda Accord 1990-1993 Honda Civic 1988-1991, 2016-2019 Honda CRX 1988-1991 Honda Integra 1990-1993 Honda NSX 1991-2005 Honda Prelude 1992-2001 Infiniti G35 2003-2008 Infiniti G37 2008+ Infiniti Q50 2014+ Infiniti Q60 2014+ Lexus SC400 1992-2000 Mazda Cosmo 1990-1995 Mazda Miata / MX-5 1990-2005 (Miata), 2006+ (MX-5) Mazda RX-7 1986-2002 Mazda RX-8 2004-2011 Mitsubishi 3000GT 1991-1999 Mitsubishi Eclipse 1990-1999 Mitsubishi Lancer / EVO All Nissan 180SX / 200SX / 240SX 1989-1998 Nissan 300ZX 1990-1996 Nissan 350Z 2003-2009 Nissan 370Z 2009+ Nissan Frontier 2005+ Nissan GT-R 2009+ Nissan Silvia 1989-2002 Nissan Skyline 1989-2002 Subaru Impreza 1993+ Subaru Legacy 1990+ Subaru WRX 2015+ Subaru WRX STi 2015+ Toyota Celica 1982-1995 Toyota MR2 1985-1995 Toyota Supra 1986-1992 Radium Coolant Expansion Tank All Why Radium Engineering? ✅ Manufactured in the USA to motorsport-grade tolerances ✅ Stamped stainless steel construction with silicone seals — superior to OEM rubber gaskets ✅ Trusted by tuners and race teams running high-power builds worldwide ✅ Available in three pressure ratings to suit street, track, and high-performance cooling systems ✅ Raises coolant boiling point and prevents water pump cavitation for maximum cooling efficiency
