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Old 08-06-2012, 12:00 AM   #1
Kmcogar
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Default 3/4 NPT thermometer?

I bought a brew kettle off of Craigslist. It has two ports for the valve and thermometer. It already had the valve but no thermometer. It measures 3/4 inches though. I can only find 1/2 inch NPT. Anyone know where I can find a 3/4 inch?


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Old 08-06-2012, 12:04 AM   #2
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If you measured the actual hole diameter at 3/4" then it IS 1/2" npt (pipe thread is not the same as actual size). Normally you make. 7/8" diameter hole for 1/2" pipe fittings.


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Old 08-06-2012, 12:15 AM   #3
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This is what came out of the threaded whole.

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Still 1/2 inch NPT? If so, I will make my purchase right away
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Old 08-06-2012, 12:34 AM   #4
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That looks like 1/2 NPT. I believe NPT sizing is based on the inside diameter of the pipe.
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Old 08-06-2012, 02:30 AM   #5
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3/4" actual is 1/2"NPT. Pipe thread items (fittings, pipes, etc.) go by ID not OD, so to get a 1/2" ID on the fittings, the OD has to be larger, which is what you've measured.


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