GReddy Type-S Radiator Cap – 1.3 Bar | Brushed Aluminium | 13901002

Verify your radiator’s cap neck type and pressure spec before ordering — radiator cap neck diameter and locking tab patterns vary across applications. The “Some Toyota” fitment qualifier means Toyota fitment is not universal — confirm your specific model before ordering.

GReddy 13901002 Type-S radiator cap, 1.3 bar pressure rating, brushed aluminium finish. Fits most Nissan, Subaru, Mazda, and Mitsubishi applications and select Toyota models. 0.12 lbs. Ships fast across Canada and the US.

1.3 Bar Pressure Rating

The pressure rating is the primary functional specification of a radiator cap. The cap holds the cooling system pressurised until the system reaches the cap’s relief pressure — at 1.3 bar (approximately 18.9 psi), the pressure relief valve opens and excess pressure is routed to the overflow reservoir. Most OEM Japanese vehicle cooling systems are rated between 0.9 and 1.1 bar from the factory. Running a 1.3 bar cap raises the system’s pressure ceiling, which in turn raises the boiling point of the coolant — higher pressure suppresses boiling — providing additional thermal headroom before the coolant boils under sustained high heat loads such as track use or heavy traffic in hot conditions.

Before fitting a higher-pressure cap, confirm the cooling system’s components — radiator tanks, hoses, and water pump housing — are in good condition. A 1.3 bar cap will stress weak or aged components more than the OEM cap. If the cooling system has not been recently serviced, inspect and replace worn hoses and verify radiator tank condition before upgrading cap pressure.

Brushed Aluminium Finish

The Type-S cap features a brushed aluminium appearance — the understated, stealth aesthetic option in GReddy’s cap lineup. The brushed finish provides a clean, premium look in the engine bay without the high-contrast appearance of a polished or anodized colour cap. GReddy also offers the Type-S in other finishes for buyers seeking a different aesthetic.

Wide JDM Fitment

GReddy’s Type-S cap uses a standard JDM radiator cap neck diameter and locking tab pattern shared across a very wide range of Japanese vehicles from Nissan, Subaru, Mazda, and Mitsubishi. Toyota fitment is partial — some Toyota models use a different cap neck size or tab pattern. Verify your radiator’s cap neck specification (neck outer diameter, locking tab pattern, and pressure rating compatibility) before ordering. The most common fitment mismatch involves small-neck vs large-neck cap specifications — confirm which your radiator uses.

Verify cap neck type and size against your radiator before ordering. Not universally compatible with all Toyota models. Inspect cooling system hoses and radiator condition before fitting a higher-pressure cap. Do not exceed the cooling system’s rated pressure capacity.

Specifications

• Brand: GReddy (Trust Co., Ltd.)
• Part Number: 13901002
• Model: Type-S
• Pressure Rating: 1.3 bar (~18.9 psi)
• Finish: Brushed aluminium
• Weight: 0.12 lbs
• Fitment: Most Nissan, Subaru, Mazda, Mitsubishi — select Toyota (verify before ordering)