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The Mercury Marine Mercury Seal 26-88397 is a water tube seal for use on various Mercury/Mariner outboard & Mercruiser stern drive engines.


Often referred to as the Race, Large, or Big Water pump Tube found on all Speedmaster SSM #4 (IV),  Sportmaster, and Torquemaster lower units as well as some SSM #6 and many sterndrives.


This seal fits on both sides of the water tube, top (motor water exit exhaust plate), and bottom (water pump housing), 


Part Numbers



Included one (1) Mercury Big Tube Water Tube Seal Grommet.


Contact Mike Hill at

Big Water Tube Grommet

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