These are NOT NPT thread. They are straight thread, meaning the threads do not taper to create a tight seal as you screw in another NPT threaded piece. Lost money and time if you need these to hold any kind of pressure. They are also quite thin. Highly doubt they will hold 1200psi as some other commenter posted. And due to the threads, they don't hold 10psi much less anything more. You will need some type of serious, PERMANENT sealant. Teflon tape WILL NOT WORK.
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