Koyo Radiator Cap

Koyo Radiator Cap
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    5 out of 55 out of 55 out of 55 out of 55 out of 5 2 reviews


     in stock
    Shipping Locations
    Michigan: 10+ Available
    Pennsylvania: 5 Available
    Nevada: 10+ Available

    Will It Fit Your Vehicle?

    This part should fit your vehicle. It is a universal part.


    Designed to fit the Koyo radiator only, Part # SK-C13 Deep plunger fits all Koyorad radiators w/ filler necks

    Extract every ounce of cooling efficiency from Koyorad All Aluminum Performance Radiators with a genuine Koyorad Hyper Cap! This Koyorad Hyper Cap withstands an increased valve pressure rating of 1.3kgf/cm2 (1.3 bar) (18.9 psi) (130 kPa) which increases the boiling point of water and relieves high performance engines of excessive heat. A genuine Koyorad Hyper Cap is recommended for use with every Koyorad All Aluminum Performance Radiator (when applicable). This Koyorad Hyper Cap is manufactured in Japan from high quality components to ensure longevity and performance from your Koyorad Racing radiator.

    Why is increased Pressure Better?

    It’s simple. When water is pressurized, its natural boiling point is increased. Most modern vehicles are equipped with a 0.9 Bar pressure cap. Koyorad’s Hyper Cap is rated at 1.3 Bar which increases the boiling temperature of your coolant to 267.80 degrees Fahrenheit. That is nearly a 56 degree increase over water's normal boiling point. By increasing the boiling point of water, an engine's cooling system will have the added heat capacity, maximizing performance under ever-changing racing conditions.


    Vehicle Fitment

    • Universal

    2 reviews for Koyo Radiator Cap

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    5.0 out of 5.0

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    5 out of 55 out of 55 out of 55 out of 55 out of 5

    9/4/2014 by Blake Beard


    What else can be said? It fits the koyo radiator like a glove and looks great!

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    7/29/2010 by Kevin Choi

    Koyo Cap for Koyo Radiator Cap

    it fits only koyo radiator. it worked great~! it's just cap.