This is the Radium Engineering Radiator Cap. These have been designed with a higher pressure which raises the boiling point to improve the overall cooling efficiency of your vehicle. Additionally, they provide an extra safety margin by preventing air pocket cavitation at the water pump. 

Radium Engineering Radiator Cap Type-B 1.3 BAR Black

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SPECS:

• Type-B
• 1.3 BAR pressure rating
• Black finish
• Stainless steel construction
• Premium silicone seal construction
• Improves the cooling efficiency by having a higher boiling point