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The ad showed the size as 1 inch. You would assume it was NPT, it was not NPT. On the valve itself it was marked "FPT" if I remember correctly and would not work with my old suction line that was NPT. The box showed 1 inch on one side and I think 22 mm on another but it was not National Pipe Thread. I had to do some "Southern Engineering" to make it work. I was disappointed.
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