Subaru JDM STI 1.3 Bar High-Pressure Radiator Cap (Red)

Upgrade your cooling system with a genuine Subaru JDM STI 1.3 bar radiator cap in classic STI red. The higher pressure rating helps raise coolant’s boiling point, supporting more stable temps when you’re pushing the car hard—spirited street driving, track days, or hot-weather runs. It’s also an easy way to add a clean OEM+ accent to the engine bay.

This cap uses a two-way valve design typically found on expansion tanks. Some Subaru setups use two caps depending on the model and cooling layout—if yours does, replacing both can help keep the system operating consistently.

Not compatible with BRZ/FR-S.

Key Features

• Genuine Subaru JDM STI radiator cap

• Pressure rating: 1.3 bar

• Two-way valve design (commonly used on expansion tanks)

• Helps improve cooling system pressure control under high temps

• STI red finish for a factory performance look

• Fitment note: Some Subaru models may use two caps; verify before ordering

• Fitment note: Not for BRZ/FR-S

Most orders ship within 1–3 days, either from our warehouse or directly from the manufacturer. We validate inventory with our vendors to provide the most accurate information possible, though occasional delays can happen.

This partner-first approach helps keep costs down and shipping times fast, with full visibility from order to delivery. Have questions? Email sales@jdmkonbini.com and we’ll help right away.