Koyo Hyper Radiator Cap 1.3 Bar Red Label Deep Plunger for Koyo Radiators
Regular price
$49.20
Verified Fitment & Application Support
This product is selected for proper fitment and compatibility with the listed engine application. Our team is available to assist with fitment questions, installation considerations, and supporting components to ensure a smooth install and reliable performance.
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Compliance & Restrictions
California Proposition 65 (Prop 65)
WARNING: This product can expose you to chemicals which is known to the State of California to cause cancer and/or reproductive harm.
For more information, visit www.P65Warnings.ca.gov.
CARB / California Emissions Compliance
This item may be restricted in California and other regions with emissions regulations. If applicable, it is intended for
competition/off-road use only unless otherwise stated. It is the customer’s responsibility to confirm local compliance before purchase.
Orders shipping to restricted areas may be canceled.
The Koyo SK-C13 is the red label version of the Koyorad Hyper Cap, a 1.3 bar high pressure radiator cap with a deep plunger. Raising system pressure above the roughly 0.9 bar used by most factory caps raises the boiling point of the coolant, which gives the cooling system more thermal headroom under sustained load.
Key Features
- Rated at 1.3 kgf/cm2 (1.3 bar, 18.9 psi, 130 kPa)
- Raises the boiling point of water to approximately 267.8 degrees F
- Deep plunger style, red label
- Manufactured in Japan
Fitment
- Koyo lists SK-C13 as the cap used by all Koyorad Racing radiators that accept a radiator cap and have a filler neck
- For 86, BRZ and some Honda and Toyota OEM style filler necks, Koyo specifies the shallow plunger SK-D13 blue label cap instead
Product Details
- Manufacturer Part Number: SK-C13
- Brand: Koyo (Koyorad)
- Pressure rating: 1.3 bar / 18.9 psi / 130 kPa
- Plunger style: deep
- Label color: red
Shipping Height: 1.0
Shipping Length: 5.3
Shipping Width: 3.0