Koyo Type A Radiator Cap (Red / 1.3 Bar) - Fits All Koyorad Race Radiators w/ Filler Neck

Extract every ounce of cooling efficiency from your Koyorad All Aluminum Performance Radiator with a genuine Koyorad Hyper Cap. Designed and manufactured in Japan, this high-performance radiator cap increases your cooling system’s pressure capacity for greater thermal stability and reliability under demanding conditions.

The Koyorad Type A Hyper Cap is rated at 1.3 kgf/cm² (1.3 bar / 18.9 psi / 130 kPa), allowing your cooling system to safely operate at higher pressures. This increase in pressure raises the boiling point of the coolant to approximately 267.8°F — nearly 56°F higher than water’s normal boiling point. The result? Improved resistance to overheating, reduced coolant boil-over, and maximized performance even in aggressive racing environments.

Precision-engineered from premium materials and built to the same strict standards as all Koyorad products, the Type A Hyper Cap ensures long-term reliability and consistent performance. It’s the perfect complement to any Koyorad aluminum radiator.

Key Features

• High-Pressure Rating (1.3 Bar / 18.9 PSI) – Increases coolant boiling point for superior thermal control
• Made in Japan – Engineered for durability, precision, and performance
• Premium Build Quality – Manufactured using high-quality, heat-resistant components
• Maximized Cooling Efficiency – Helps prevent overheating in high-performance engines
• Perfect Fit – Compatible with Koyorad radiators featuring filler necks (except FRS/BRZ)

Specifications

• Pressure Rating: 1.3 Bar (18.9 PSI / 130 kPa)
• Boiling Point Increase: Up to 267.8°F (56°F over standard water boiling point)
• Material: High-strength steel and heat-resistant sealing components
• Origin: Made in Japan
• Compatible with Koyorad radiators featuring filler necks

Upgrade your cooling system with the Koyorad Type A Hyper Cap — the perfect finishing touch for any performance or track-ready setup. With increased pressure capacity and exceptional Japanese craftsmanship, it’s a simple upgrade that makes a measurable difference.