Floscan Pre-Installation Manual for Diesel Models User Manual
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USA Standard Dryseal Pipe Thread, (NPTF)
(National Pipe Thread Fuels) are very similar to NPT pipe threads, except they are shaped to make first contact at their roots
and crests. When the joint is made tight with a wrench, the thread crests are crushed until the thread flanks make full contact.
They don’t have the built in leakage path of NPT threads, but can still leak due to machining imperfections. When
assembling NPTF fittings, a Thread Sealant-Lubricant must always be used.