Description
SIERRA Marine O-Ring, 3.1 x 0.135 in – 18-7121 is a replacement sealing O-ring for select OMC and Mercury/MerCruiser drive applications. Its published dimensions are 3.100 in inside diameter by 0.135 in cross-section, making size verification straightforward before installation.
Use the OEM interchange and measured seal dimensions together to confirm fitment. Clean the groove and mating surfaces before assembly, and lubricate only with a fluid compatible with the system and seal material.
Key Features
- 3.100 in inside diameter
- 0.135 in cross-section width
- single configuration
- For select OMC and Mercury/MerCruiser drive applications
- OEM interchange provided below for fitment verification
Specifications
- Sierra part number: 18-7121
- Product type: Marine O-ring
- Inside diameter: 3.100 in (78.7 mm)
- Cross-section width: 0.135 in (3.4 mm)
- Package quantity: 1
Interchange
- GLM: 82350
- Mallory: 9-76651
- MerCruiser: 25-35029, 27-882613, 802231
- Mercury Marine: 25-35029
- OMC: 308621
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