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Mishimoto 1.3 Bar Radiator Cap Small - Universal
Mishimoto 1.3 Bar Radiator Cap Small - Universal
Mishimoto 1.3 Bar Radiator Cap Small - Universal
Mishimoto 1.3 Bar Radiator Cap Small - Universal
Mishimoto 1.3 Bar Radiator Cap Small - Universal
Mishimoto 1.3 Bar Radiator Cap Small - Universal

Mishimoto 1.3 Bar Radiator Cap Small


Read 1 Reviews | 3 Q&As
Part # MMRC-13-SM
msrp: $26.00

In stock!
Ships today if ordered in
2 hrs 32 mins
Universal part

Features & Product Details

RallySport Direct is proud to bring you high-performance automotive cooling components brought to you by Mishimoto. 

Here, you are looking at the Mishimoto High-Pressure 1.3 BAR Radiator Cap. This particular radiator cap has been designed to raise the boiling point of the engine to make your overall cooling system more efficient. 



  • Small profile
  • 1.3 BAR (19 psi) high-pressure radiator cap raises the boiling point of the engine coolant to provide a safer and more efficient cooling system 
  • Ergonomically designed for easy removal and installation
  • Performance aluminum
  • Suitable for radiators that require a small radiator cap
  • Patent-pending design 
  • Will fit most 31-32mm fill necks



    Brand: Mishimoto
    Opening Point: 1.3 Bar
    Mfgr. Warranty: Limited Lifetime
    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.
    RallySport Guarantee



    1 Reviews
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    0 of 1 people found the following review helpful
    Leaks 12 months ago
    1out of 5stars

    Had this cap on my car for about a year. It just spews coolant every time I drive now. Bad leak.
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    • Q: Subaru Impreza STI 2006  .2 years ago

      I have a Mishimoto aluminium radiator in my 2006 STI. Does this cap go on the Mishimoto radiator or the expansion tank? It this cap a two-way or a single valve? There are 2 questions regarding this under this product but both have contradicting answers. Can I use it on Mishimoto radiator?
      • 2 of 2 people found the following answer helpful

        A:  This cap CANNOT be used on the OEM or Aftermarket replacement radiators this cap is only designed for the expansion tank. This cap is a single valve.

        Jared A. @ RallySport Direct 2 years ago  
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    • Q: Radiator Cap  Airefire2 years ago

      Can this cap be safely used on the Mishimoto radiator? This is really confusing to me.
      • 0 of 4 people found the following answer helpful

        A:  If the radiator is the correct size for the cap it should work.

        Devan M. @ RallySport Direct 2 years ago  
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      • 1 of 1 people found the following answer helpful

        A:  The staff answer to this question needs to be removed or edited, as it is contradictory to all other answers, and also appears to be incorrect. Both Mishimoto and RallySport Direct have stated in multiple locations that this cap cannot go on any radiator, OEM or aftermarket, and should only go on the expansion tank. Perhaps more clarification is needed, since this is a universal product.

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    • Q: Using this cap on the radiator  gator.hudson456934 years ago

      On the Mishimoto website it says on their X-Line Radiator page: "CAUTION The provided Mishimoto radiator cap should replace the stock cap located on the expansion tank. The stock cap attached to the radiator should be installed on the Mishimoto Performance Aluminum Radiator. The Mishimoto radiator cap is a two way valve, while the stock radiator cap is a single valve. Due to the difference in construction, the Mishimoto cap cannot be used on the radiator. If the Mishimoto cap is fit on the radiator, overheating may occur." Is this the same cap that Mishimoto provides with their radiator that really goes on the expansion tank, or one that works on a stock radiator? It looks the same.
      • 2 of 3 people found the following answer helpful

        A:  You cannot use a Mishimoto cap on the radiator weather it be a Mishimoto or OEM the OEM cap has a different design then Mishimoto's. The mishimoto cap provided with the radiator is to be used on the expansion tank.

        Brady R @ RallySport Direct 4 years ago  
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    This Part Fits

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