It's a 1988 150 Mercury out board it has two thermostats 143 degrees they come with a rubber seal/gasket that fits into a groove one side of the seal is sticking up a little looks kind of like a hat the part that's higher on the seal does it face down towards the longer part of the thermostat or does it face up towards the shorter part of the thermostat , now I have been replacing them for along time but when I look at pics of the thermostat some times it's facing up and sometimes it's facing down I would just like to do it the right way and does it make a differance? I don't know .
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