New factory Mazda OEM coolant water thermostat neck o ring for NA and NB Mazda Miata. This is the rubber o-ring that seals the cast aluminum coolant pipe to the front of the cylinder head. The thermostat goes into the other end of this pipe and then thermostat housing attaches to it. O ring seal only. Part number B61P-15-106A. Fits 1990-2005.
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