This is typical of prefabricated seamless fittings; has no inner groove for an O-ring on the outside. This means that the O-ring must be pressed into the thread. I couldn't get it to seal. I ended up with a thick 1.13 ID X .052 stainless washer (McMaster) and another thin washer close to the male thread. External hex, then thin washer, then o-ring with 1.13 washer outside so it doesn't stick out, then pot, then nut inside with no o-ring. It works, but it's not that great. And the inner diameter of the protection tube is actually too big for my sensor, so I had to fill it with thermal paste. But the general build quality is good.
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