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These replace your Mercury 2-stroke outboard thermostats with new seals and restrictor washers to regulate water pressure and flow for high-performance racing and river running.


Includes two (2) Thermostat Seals with Stainless Washers.



1) 3/32" ID washers (small) for more/higher water pressure

2) 1/8" ID washers (medium) for medium water pressure

2 Mercury Thermostat Seals + Washers

SKU: SW-77
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