I have a 1 1/4" hose and this assembly is narrowed for a 1" hose after the 3/8" "sensor assembly installed in NPT looked very limited. My truck is running and not overheating yet. I have to take my trailer up a big hill in 100 degree weather to see if this restriction is causing the problem or not. If you need a quick fix this works and is built very nicely. Smaller temp sensors probably won't be a problem, but mine is 3/8" NPT and covers most of the hole.
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