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New Marine O-Ring 3.000 Id 0.135 Width Nitrile Nbr Black Compatible With 1970-1997 Mercury Mariner

18-7151A5
OEM PART NUMBERS:
• Mercury: 25-20081 / 2520081
• MerCruiser: 25-39572 / 2539572

SPECIFICATIONS:
• Type: Standard O-Ring Seal
• Inside Diameter (I.D.): 3.000 Inch (76.2 mm)
• Width / Cross-Section: 0.135 Inch (3.4 mm)
• Outside Diameter (O.D.): Approximately 3.270 Inch
• Material: Nitrile (NBR) Standard Marine Grade Rubber
• Color: Black
• Application: Multi-Purpose Marine Sealing
• Engine Compatibility: Mercury, Mariner, MerCruiser
• Condition: New

APPLICATIONS:
• Mercury Outboards: 30/40/45/50 HP Cross Flow 4-Cyl 2.565 Bore (1970-1997)
• Mercury Outboards: 65/80 HP 4-Cyl (1970-1972)
• Mercury Outboards: 115/135 HP Cross Flow 6-Cyl 2.875 Bore (1970-1972)
• MerCruiser Sterndrives: Bravo Two, MC 3 HP, SSM 2/3/4 HP
• Mariner Outboards by OEM Part Number Match

PRODUCT NOTICE:
As a parts distributor we mostly sell aftermarket parts (any OEM parts would be noted as such). Aftermarket parts are not sourced from the original vehicle or equipment manufacturer, but are designed to function the same as - if not better than - the original. All parts sold are new.

WARNING - This product may expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

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Description

O-RING — MERCURY/MARINER/MERCRUISER 3.000 ID x 0.135 WIDTH MULTI-APPLICATION:

MERCURY OUTBOARD APPLICATIONS:
• Mercury 4 Cyl 30 HP 2.565 Bore Cross Flow 2-Stroke Outboard (1989-1997)
• Mercury 4 Cyl 40 HP 2.565 Bore Cross Flow 2-Stroke Outboard (1989-1997)
• Mercury 4 Cyl 45 HP 2.565 Bore Cross Flow 2-Stroke Outboard (1980-1989)
• Mercury 4 Cyl 50 HP 2.565 Bore Cross Flow 2-Stroke Outboard (1970-1985)
• Mercury 4 Cyl 65 HP 2-Stroke Outboard (1970-1971)
• Mercury 4 Cyl 80 HP 2-Stroke Outboard (1970-1972)
• Mercury 6 Cyl 115 HP 2.875 Bore Cross Flow 2-Stroke Outboard (1970-1972)
• Mercury 6 Cyl 135 HP 2.875 Bore Cross Flow 2-Stroke Outboard (1970-1971)

MARINER OUTBOARD APPLICATIONS:
• All Mariner Outboard Models Requiring OEM 25-20081 / 25-39572 by Part Number Match

MERCRUISER STERNDRIVE APPLICATIONS:
• MerCruiser Bravo Two Sterndrive
• MerCruiser MC 3 HP Sterndrive
• MerCruiser SSM 2 HP Sterndrive
• MerCruiser SSM 3 HP Sterndrive
• MerCruiser SSM 4 HP Sterndrive

O-RING SPECIFICATIONS:
• Inside Diameter (I.D.): 3.000 Inch (76.2 mm)
• Width / Cross-Section: 0.135 Inch (3.4 mm)
• Outside Diameter (O.D.): Approximately 3.270 Inch
• Material: Nitrile (NBR) Standard Marine Grade
• Color: Black
• Type: Standard O-Ring Seal

FUNCTIONAL APPLICATION:
Multi-purpose sealing O-ring used across many Mercury, Mariner, and MerCruiser models. The 3.000 inch I.D. with 0.135 inch cross-section is a common Mercury Marine sealing dimension used for various sealing applications including water pump components, lower unit sealing, gearcase sealing, and engine block sealing locations where the OEM part number 25-20081 or 25-39572 is specified.

TYPICAL O-RING SERVICE LOCATIONS (BY OEM PART NUMBER):
• Lower unit / gearcase sealing applications
• Water pump assembly sealing
• Mercury Quicksilver service kit replacement
• Cross-flow 4-cylinder powerhead sealing
• Cross-flow 6-cylinder powerhead sealing
• Various sterndrive sealing locations

FITMENT NOTE:
This is an OEM-spec replacement O-ring. ALWAYS verify the OEM part number from your service manual or parts diagram before ordering — confirming Mercury 25-20081 or MerCruiser 25-39572 is the correct part for your specific application. O-rings serve multiple functions in Mercury Marine engines, and using the correct part by OEM number is essential to ensure proper sealing. Not all engines using the listed bore sizes/HP ratings will use this specific O-ring at every sealing location.

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  • 0.0 lbs.
  • W9.0000” x H0.5000” x L12.0000”
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