Quote:
Originally Posted by OakHouse411
Help! My water temperature gauge has stopped working. What thread is the fixing nut union please?
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From memory, the thread on the nut for the bulb is 3/8" BSP. The thread in the manifold is either 5/8" UNF or 1/4" NPT. They have the same diameter and pitch but NPT is tapered. A straight union should screw far enough in to a tapered hole on the manifold for a decent hold but will need a bit more thread sealant.