Use hydraulic fracturing rated pipe dope. Since fracking uses preasures in excess of 9,000psi at the well head and something like 13,000 or 14,000psi at total deapth you know it will work.
I used it on my 7hp gasoline pressure washer which runs some where between 2,000 and 2,500psi on its pipe thread connections since 2008 and I don't think any have ever leaked. The only ones that leaked were the ones I used Teflon tape on.
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