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Koyo SK-C13 Type A Radiator Cap (Red / 1.3 Bar)

4.3 (10) Write Review
Free shipping on orders over $29.99

$34.84

$ 17 .99 $17.99

In Stock

About this item

  • Koyo leads the radiator industry in quality, performance, fitment, and extensive list of vehicle applications
  • Our quality begins with the careful testing in our R&D department, then to the manufacturing in Koyo’s privately owned ISO 9001 certified factories, and finally to our class leading packaging
  • Koyo's process assures that each Koyo OE aftermarket replacement radiator arrives safely and performs perfectly in the hands of the shop and end user
  • Our engineers carefully design our radiators offering a true plug and play installation: No drilling, cutting, relocating, or stretching to get our radiators to fit properly
  • When you buy a Koyo radiator, you will receive a component that has been engineered to the highest standards


Koyo Quality begins with our selection of premium OE grade materials such as: aluminum, copper, brass, and plastics. Koyo products are not only developed and tested to be resilient to harsh outside elements, but also years of under-hood heat cycling as well.


Eric C.
September 7, 2025
Fit perfectly on my aftermarket expansion tank, koyorsd is always quality
Kevin Delaney
August 19, 2025
So far so good. Works as intended on my 07 350z. Good build quality. This is one of those kinds of parts that it either works well or it doesn't, this fits my car and does what it's supposed to. Highly recommend, I have a Koyo solid aluminum radiator too, so take that into consideration as well. Radiator is significantly better than the stock one as well, so I recommend that as well.
Audrey Rae
August 14, 2025
Did it’s job and has held up well so far
Aesir11D
July 28, 2025
The WRX stock has a radiator cap that keeps engine hotter than necessary. This is for emissions only and robs power & response. Best $40 bucks you can spend
Brian
July 9, 2025
Needed a spare to cap to diagnose a problem with the cooling system. Both caps work perfectly.
Khamla
May 22, 2025
Hate myself for buying this but koyorad doesnt give you a cap.
devolution
March 22, 2025
This radiator cap appears to be very well made. I bought one hoping it would fit the OEM radiator for my 3.0L Outback, but the opening on the stock radiator is really small and the seal on this cap is not. It's definitely made for Koyo's aftermarket radiator and/or the 2.5L turbo H4 Subaru stock system (not sure on that one). I returned this one and unfortunately have no options for a 1.3 bar cap unless I replace my radiator, so I'll be sticking with the stock one, I guess.
Carly
February 4, 2025
It's the most expensive radiator cap I've ever purchased but I did buy the high performance koyo radiator so I didn't want to take a chance on a budget cap.
Ottis Williams
January 7, 2025
I like the way the cap looks on the red I like the fact that it doesn't leak and I would recommend it for anyone who has a Koyo radiator
Jim Karst
January 2, 2025
Just as advertised.