O-Ring - 18-7420-9 - Sierra
Price: $6.54
Save: $3.72
(36% Off $10.26)
Part # 18-7420-9
2nd Day Air for $2.99 More Eligible
No Reviews
This item is found in the following Product Families
Dimensions ( in )
I.D. .862
Width .139

Replaces OEM part #
  • MERCURY MARINE 25-21836
  • MERCURY MARINE 25-25439
This product ships in 1 business day.
Add to Cart and enter your Postal Code to determine the shipping charges.
Most products and orders leave our warehouse in 1 business day. However, select items may take more processing time. Alaska and Hawaii orders please add 1 additional warehouse processing day.
Standard Shipping Policies
Do you need Professional Installation? has teamed with a national network of independent installers that are ready to handle your installation needs.
Find your local Amtech dealer: