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If the nut will screw onto the straight threads then I think Mylesdw is correct in saying the threaded brass fitting is turned around on the temprature bulb incorrectly. The tapered thread (shown near the nut) goes into the manifold and the nut creates a compression seal on the shoulder of the bulb against the straight threaded portion of the threaded adapter.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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