On orders over $100
100% Money Back on Select Parts
Product images
Product Media
Cosworth 1.3 Bar High Pressure Radiator Cap (Part Number: )
Cosworth 1.3 Bar High Pressure Radiator Cap (Part Number: )
Cosworth 1.3 Bar High Pressure Radiator Cap (Part Number: )
Cosworth 1.3 Bar High Pressure Radiator Cap (Part Number: )
Cosworth 1.3 Bar High Pressure Radiator Cap
This item is no longer available.
Universal part

Features & Product Details

Cosworth High Pressure Radiator caps are engineered to increase the boiling point in your vehicles cooling system providing improved cooling efficiency. Each cap is manufactured from heavy gauge stainless steel with a race proven high pressure valve. The Cosworth High Pressure Radiator Cap is an essential part of an upgraded cooling system and will help to safely maximize engine performance by controlling the engine temperature at an optimum level. Available in 3 pressure ratings.

Application: Most Subaru, Nissan, Mitsubishi Lancer Evolution vehicles and early Honda (EG/DC) as well as pre 1995 Toyota applications.

This cap will not fit the BRZ/FR-S twins.


Brand: Cosworth
Opening Point: 1.3 Bar
Mfgr. Warranty: 1 Year
Condition: New Product
Return Policy:

RallySport Guarantee - 30 Days

Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.



8 Reviews
4.5 out of 5 Stars
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Customer Photos and Videos
No user media. You can upload a photo or video of your install by posting a review.
Cosworth doing what they do best....keeping you moving 2 months ago
5out of 5stars

Well packaged product and obviously easy to install. Love the blue gaskets on them and they work very well to maintain system pressures. Would definitely recommend this product to anyone building their Subaru to higher horsepower levels.
Was this review helpful?
2 of 2 people found the following review helpful
Retracting previous review 5 years ago
1out of 5stars

This cap began leaking coolant shortly after it was installed. I began thinking it was a head gasket issue or the overflow lines, but after much frustration, I traced the problem back to the cap. After replacing it with the stock unit, the problem immediately disappeared and the smell of burning coolant after each drive is gone. As always, customer service at RSD was quick to remedy the problem and their support is to notch. I always assumed coswortth was a byword for quality, but in this case I was disappointed
Was this review helpful?
Nice 5 years ago
5out of 5stars

Quality part and nice looking. No complaints
Was this review helpful?
Radiator Cap 6 years ago
5out of 5stars

i am very happy with this cap put it on my 2013 STI hatch.
Was this review helpful?
Good 6 years ago
5out of 5stars

Used this as a replacement for my OE rad cap since it was leaking, price was right and it works
Was this review helpful?


  • Q: Mishimoto  Michell Lopez6 years ago

    Work on my Mishimoto radiator and my stock raidator for subaru sti 08?
  • Q: cap quesiton  Subarutah6 years ago

    just to double check is this cap compatible with a koyo alum radiator?

This Part Fits

Universal Product
This item is non application specific.
Please verify compatibility before purchase. May require some modification for proper installation.