What specific Harley-Davidson engine types does this O-ring set fit?

This O-ring set is designed for Harley-Davidson EVO, XL, Twin Cam (T/C), and Milwaukee-Eight (M8) engine platforms. It is suitable for crankcase oil plugs and cylinder base dowels.

Do I need to use any RTV sealant with these O-rings?

No, these O-rings are designed to be installed without any additional sealer. They are manufactured to provide a proper seal on their own.

What is included in this product?

This product includes a pack of ten (10) O-rings. These are intended for use as crankcase oil plugs or cylinder base dowel O-rings.

Specifications

Brand: Cometic Gasket
Part #: C9435
UPC: 191070017897

Cometic Harley-Davidson Engine, Trans Drain Plug All EVO Xl, T/C, M8, 10Pk

Name: Cometic Harley-Davidson Engine, Trans Drain Plug All EVO Xl, T/C, M8, 10Pk
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-harley-davidson-engine-trans-drain-plug-all-evo-xl-t-c-m8-t14-692421
Price: 9.26 USD
Availability: BackOrder

$9.26

On Backorder — Expected to ship by Jun 6, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Key Features

This package contains 10 O-rings for crankcase oil plugs and cylinder base dowels.
No additional sealer is needed for installation.
Made in the USA with materials manufactured on American soil.
Designed for Harley-Davidson EVO, XL, Twin Cam (T/C), and Milwaukee-Eight (M8) engine platforms.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

This package includes ten O-rings, specifically designed for crankcase oil plugs and cylinder base dowels on a wide range of Harley-Davidson motorcycles. These O-rings are made in the USA by Cometic Gasket, a company known for its commitment to quality sealing solutions.

These O-rings are built to handle the demands of modern, high-horsepower engines, which often produce higher cylinder pressures and extreme temperatures. They are designed to be a direct replacement and do not require any additional sealer, making installation straightforward. Cometic continually updates its library of gaskets for various powersports applications, including Harley-Davidson V-Twin engines.