• 15+ Years of Performance Parts, Tuning & Installation
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Cometic .031 Viton O-Ring - Brown

  • Backed by real installs and tuning experience at FAST of West Chester
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$5.42
$5.42
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All of Cometic's gaskets and seals have been tested on both the street and the track as well as vigorous Dyno shakedowns

  • All of Cometic's gaskets and seals have been tested on both the street and the track as well as vigorous Dyno shakedowns

This Part Fits:

Year Make Model Submodel
2021 Gas Gas EX 250F Base
2021 Gas Gas EX 350F Base
2021 Gas Gas EX 450F Base
2021 Gas Gas MC 250F Base
2021 Gas Gas MC 450F Base
2014-2021 Husqvarna FC250 Base
2014-2021 Husqvarna FC350 Base
2014-2021 Husqvarna FC450 Base
2018,2020 Husqvarna FC450 Rockstar Edition Base
2014-2019 Husqvarna FE250 Base
2014-2021 Husqvarna FE350 Base
2016,2020-2021 Husqvarna FE350S Base
2016-2019 Husqvarna FE450 Base
2014-2021 Husqvarna FE501 Base
2016,2020-2021 Husqvarna FE501S Base
2017-2020 Husqvarna FS450 Base
2017-2020 Husqvarna FX350 Base
2017-2021 Husqvarna FX450 Base
2017-2019 KTM 250 EXC-F Base
2014-2021 KTM 250 SX-F Base
2016 KTM 250 SX-F Factory Edition Base
2021 KTM 250 SX-F Troy Lee Designs Base
2013-2021 KTM 250 XC-F Base
2014-2016 KTM 250 XCF-W Base
2012-2021 KTM 350 EXC-F Base
2011-2021 KTM 350 SX-F Base
2012-2021 KTM 350 XC-F Base
2021 KTM 350 XC-F Kailub Russell Base
2012-2016,2020-2021 KTM 350 XCF-W Base
2016 KTM 350 XCF-W Six Days Base
2009-2010 KTM 400 XC-W Base
2019 KTM 450 EXC-F Six Days Base
2008 KTM 450 EXC-R Base
2021 KTM 450 SMR Base
2012-2021 KTM 450 SX-F Base
2012-2013,2016,2020 KTM 450 SX-F Factory Edition Base
2013-2021 KTM 450 XC-F Base
2008-2016 KTM 450 XC-W Base
2012-2016 KTM 500 EXC Base
2012,2016 KTM 500 EXC Six Days Base
2017-2021 KTM 500 EXC-F Base
2020-2021 KTM 500 EXC-F Six Days Base
2012-2016 KTM 500 XC-W Base
2020-2021 KTM 500 XCF-W Base
2008 KTM 530 EXC-R Base
2008-2011 KTM 530 XC-W Base
2015-2021 Yamaha WR250F Base
2016-2021 Yamaha WR450F Base
2014-2021 Yamaha YZ250F Base
2021 Yamaha YZ250F Monster Energy Yamaha Racing Edition Base
2010-2021 Yamaha YZ450F Base
2021 Yamaha YZ450F Monster Energy Yamaha Racing Edition Base
2016-2021 Yamaha YZ450FX Base
  • Earn FAST points on this part!
  • Backed by real-world installs
  • FAST WC Team Approved
Cometic .031 Viton O-Ring - Brown

$5.42

Why Drivers Choose FAST of West Chester

  • I can't recommend this place enough. Being able to trust a shop in the performance world is big. The 2hr drive to get there, is worth knowing the job will be done right. Very happy to have found this shop, to
    support my builds going forward.

    Donald Wojnar

  • I recently had the pleasure of working with FAST of West Chester for some performance upgrades on my 2022 WRX, and the experience was nothing short of exceptional. I opted for a Borla S-Type exhaust and Cygnus Coilovers, and the team at FAST nailed the installation, fitment, and setup to a T.

    Adam Cranston

  • The team at FAST are excellence in every way. First, I consulted with Dave on mods for my HPDE track car. He listened and advised me on the best parts & mods to achieve my goals. He was patient & gave me space to research the options presented & worked with me through several changes before we built. Second, the build execution was flawless, proper heat shielding, bracing and poly everywhere. All components worked as advertised.

    Bryce Budd

  • This place has been my go to shop for all things Subaru. From simple service to performance parts and tuning, they have been top notch.

    William Brunell

  • Excellent shop. They installed a Cobb Stage 2 DP and Whiteline Sway bars and end links on my 2013 WRX. The work was done right and clean. The estimate was accurate. They were very knowledgeable, friendly and gave me the straight scoop on exactly what I was getting for the money
    and what I needed to get where I want to be with it. I'd recommend them
    to any car enthusiast.

    Devin Greco

Does it come with a warranty?

Most products we carry include a manufacturer warranty. Since we work with top performance brands, warranty coverage can vary by product. If you have questions about a specific item, reach out — we’re happy to help.

Do you offer installation help or advice?

Yes — we don’t just sell parts, we install and tune them too. FAST of West Chester is a real performance shop, and we’ve worked hands-on with many of the products we carry. If you have questions about fitment, installs, or building your setup, our team can point you in the right direction.

How fast is shipping?

Many of our products ship the same day or next business day, depending on availability. We work hard to get parts out fast so you can get your build moving without delays.

What’s your return policy?

Returns for exchange or refund are accepted within 30 days of receiving your order. Items must be in new, unused condition and in original packaging. If you have any questions, our team will help make the process easy.

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