Description
Comparison points and tradeoffs
When comparing 88397A1 Upper Unit Seal Kit for Mercruiser Alpha one 1 Gen 2 Stern Drive 26-88397A1 Sierra 18-2644 with other Seals options, use this source-backed detail as the primary discriminator: Fit for Mercruiser Alpha I Gen II 1991-1995 (0D469859 – 0F679999), 1996 & Up (0F680000 & Up).
Use this second fact to evaluate the tradeoff: Package Contains: O-Ring 25-25439, O-Ring 25-35027, O-Ring 25-35984 25-70937, O-Ring 25-32546, Oil Seal 26-32080, Oil Seal 26-37259, Seal 26-88397, Drain Screw Gasket 12-19183 12-20260, Seal Ring Gasket 26-45577. A third point to compare across alternatives is: Please check your outboard model, serial number and year carefully before you purchase. If you are not sure, you can contact to us, we are pleasure to help you!
Alternative-selection boundary
Choose an alternative when its stated identifiers, application, package, or specifications better match the requirement; no unverified competitor claim is introduced here.
Complete source-backed product details
Product Description
SeaSierra Upper Unit Seal Kit for Mercruiser Alpha one I Gen II Stern Drive
Package Include:
2 X O-Ring 18-7153, 25-25439
1 X O-Ring 18-7117, 25-35027
1 X O-Ring 18-7169, 25-35984 25-70937
1 X O-Ring 18-7161, 25-32546
1 X Oil Seal 18-2003, 26-823894 26-32080
2 X Oil Seal 18-2056, 26-66302 26-37259
1 X Seal 26-88397
2 X Drain Screw Gasket 18-2945, 12-19183 12-20260
1 X Seal Ring Gasket 18-2944, 26-45577
Replace OEM:
Mercruiser 26-88397A1
Mallory 9-74302
GLM 87501
Sierra 18-2644
Compatibility:
Alpha I Gen II 1991-1995(D469859 – 0F679999)
Alpha I Gen II 1996-1997(0F680000 – 0K999999)
Alpha I Gen II 1998-up(0L100040-up)
Notes:
Please check your outboard model, serial number and year carefully before you purchase. If you are not sure, you can contact to us, we are pleasure to help you!
Source product highlights
- This Alpha 1 Gen 2 Upper Unit Seal Kit is design for Mercruiser Stern Drive
- Fit for Mercruiser Alpha I Gen II 1991-1995 (0D469859 – 0F679999), 1996 & Up (0F680000 & Up)
- Replace OEM: Mercruiser 26-88397A1, Mallory 9-74302, GLM 87501, Sierra 18-2644
- Package Contains: O-Ring 25-25439, O-Ring 25-35027, O-Ring 25-35984 25-70937, O-Ring 25-32546, Oil Seal 26-32080, Oil Seal 26-37259, Seal 26-88397, Drain Screw Gasket 12-19183 12-20260, Seal Ring Gasket 26-45577
- Meets OEM quality standards and is easy to install. Please confirm your model number before installation, if you have any questions, please contact us we are happy to help you!




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