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NPT threads

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chiru

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Hello, some of my NPT fittings grip on only 3 threads. Is it normal ? I Can eventually tap more but it’s annoying.
The picture is the fuel return from the pump. I would prefer not inserting some metal inside. Also for the fuel pickup tube adapter I would need a 3/4” tap…
739F04DB-6EF5-4103-85D3-7A9717C66666.jpeg
 

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