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Mercury Marine

Piston O-Ring 25-F449278

Satisfaction rating 5 out of 5 (9 Ratings)
You save $.51. (20%) $2.5
ONLY 3 REMAINING Ships Immediately
  • This is an OEM part manufactured by Mercury Marine
  • Flat rate shipping starting at $4.95
  • 30 day return policy

Product Description

Mercury factory part. Click here to search for more factory parts or view parts diagrams.

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9 Product Reviews


85 hp Force

Repair Difficulty
Repair Time
2 to 4 hours
Great service, extra fast delivery and priced just right

Problem fixed: Tilt/trim system

Had leak I was not aware of going into winter. Just found system filled with water and ruined some internal o-rings from ice build up. Crowley had all the parts for my vintage 1989 system.

Have had no problems so far this year. The orders we have placed have been complete and arrived on time.

Great response, fast mail service.

US Marine Force 125

Repair Difficulty
Repair Time
More than 4 hours
They kept me informed of the status of my order and delivered everything quickly.

Problem fixed: Trim/tilt was not maintaining height

Pulled entire unit off the stern. Opening the trim cylinder was a problem. Two of the 5 1/4-20 bolts sheared off at the top of the threads and then at the point of insertion in the lower section of the cylinder. Had to get the two broken bolts drilled and extracted. Chased the threads to bolt everything back together.

Crowley had some Hart’s to find parts. Service was excellent.



Force 125

This was one of the only places that had replacement o-rings for the trim cylinders on my 1988 force 125 engine.

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Due to manufacturer policy OEM Mercury products can only be shipped to addresses within the United States.