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:

Type A Vehicle Fitment Guide:

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