New factory Mazda OEM 1.8 liter engine coolant water thermostat neck for Late NB Mazda Miata. This is the aluminum pipe that attaches to the front of the cylinder head. The thermostat goes into the other end of this pipe and then the thermostat housing attaches to it. Hardware, thermostat, and thermostat housing not included. Part number BP6D-15-170A. Fits 2001-2005.
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