Upgrade your cooling system performance with the Trust / GReddy 13901003 High‑Pressure Radiator Cap (Type‑N). Engineered for reliability under increased thermal load, this cap raises cooling system pressure to help prevent coolant boil‑over during spirited driving or track use.

The 13901003 is a Type‑N radiator cap with a 1.3 bar (1.3 kg/cm² / 127 kPa) pressure rating. Manufactured in Japan by TRUST, it features durable stainless‑steel construction and a high‑temperature silicone seal to ensure consistent pressure control and long service life.

Key Features

• GReddy Type‑N high‑pressure radiator cap
• 1.3 bar opening pressure to raise coolant boiling point
• Improves cooling efficiency under high load conditions
• OEM‑style direct replacement for compatible radiator necks
• Stainless steel cap with silicone sealing
• Made in Japan by TRUST

Vehicle Compatibility

The GReddy 13901003 is a Type‑N radiator cap, designed for vehicles that utilise a Type‑N / standard‑depth radiator neck. Type‑N caps are commonly found on many Japanese vehicles, particularly certain Honda and Toyota models, as well as vehicles fitted with compatible aftermarket radiators.

Common Applications Include:

• Honda models (Civic, Accord, Prelude, Integra, CRX – excluding models requiring Type‑S)
• Toyota models using Type‑N radiator necks
• Subaru BRZ / Toyota 86 (with Type‑N radiator configuration)
• Selected Mitsubishi, Mazda, and Suzuki models with Type‑N fitment

Important: Radiator cap fitment depends on radiator neck depth and design, not vehicle model alone. Some vehicles use a Type‑S cap instead. Please confirm your existing radiator cap style before purchase.

Why Use a High‑Pressure Radiator Cap?

A high‑pressure radiator cap increases the cooling system’s operating pressure, which raises the boiling point of the coolant. This helps prevent coolant from boiling, foaming, or escaping into the overflow system during high‑temperature operation.

• Improves resistance to overheating
• Reduces coolant loss under sustained load
• Maintains stable cooling system pressure

Note: High‑pressure radiator caps should only be used on cooling systems in good condition. Worn hoses, aging radiators, or compromised seals may fail under increased pressure.