Gaskets and Seals O-rings, Grommets and Vacuum Caps

SIERRAMARINE

O-Ring

$13.00

SKU: S08C 18-7428-9

In Stock
In Stock
Ships by Aug 30
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item

Overview

The Sierra Marine 18-7428-9 is an O-ring, priced per package of 2. Sealing the gap between two parts with an O-ring prevents leaks of fluids and gases.
Show original supplier description
The Sierra Marine 18-7428-9 is a durable O-ring set, packaged as a set of two. It serves as a direct replacement for OEM part number 0307103, offering reliable performance and fitment. Its primary function is to maintain the integrity of the gearbox by sealing potential leak paths, contributing to the overall health and efficiency of the outboard motor.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandSIERRAMARINE
Part NumberS08C 18-7428-9
CategoryGaskets and Seals

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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