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Add to CartThis item has been discontinued by the manufacturer and is repalced by 18-7420-9
Sierra high-quality engine parts are designed to meet OEM specifications. For Mercruiser Stern Drives and Mercury Marine engines.
Interchangeable with:
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
Sierra 18-7121 O-Ring Replaces 25-35029 I.D. 3.100" or 78.7mm Width: 0.135" or 3.4mm Interchangeable with: GLM 82350 Mallory 9-76651 Mercruiser Stern...
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Sierra 18-7120 O-Ring Replaces 25-25007 I.D.: 0.215" or 5.5mm Width: 0.065" or 1.7mm Interchangeable with: Chrysler/Force/US...
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Sierra 18-7102 O-Ring Replaces 25-62706 I.D.: 0.430" or 11mm Width: 0.065" or 1.7mm Interchangeable with: Chrysler/Force/US Marine 25-F468342 GLM 80130 Johnson/Evinrude...
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Sierra 18-7134 O-Ring Sierra high-quality engine parts are designed to meet OEM specifications. I.D.: 0.500" Width: 0.100" Interchangeable with: Chrysler/Force/US...
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