Thermostat Kit – Fits Mercury/Mariner 70-125 HP 2-Stroke (Replaces 803061T1) 3.3-5 2-Stroke The best way to confirm

The best way to confirm fitment is to check the "Engine & Model Compatibility" table on this page and

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Unbolt and carefully remove the lower unit from the outboard's driveshaft housing

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Install the new O-ring and place the new fuel pump assembly in position

Thermostat Kit – Fits Mercury/Mariner 70-125 HP 2-Stroke (Replaces 803061T1) 3.3-5 2-Stroke The best way to confirmProduct Details This Thermostat Kit Fits Mercury Mariner 70 125 HP 2 Stroke (Replaces 803061T1) provides a reliable, direct fit replacement for maintaining the cooling system on inline 3 & 4 cylinder outboards from 1987 and newer. Engineered to regulate engine temperature, this kit ensures your motor operates within its optimal temperature range, preventing both overheating and overcooling. This component is a direct interchange for Sierra 18 3569,