What kind of pipe nipple to use on my well pitless adapter
I just recommend using brass fittings for all of that stuff.


1" brass close nipple
1" FPT x 1" Brab brass female insert adapter




If you can't find a female insert adapter, you can basically make one using a 1" female-female coupler + 1" male MPT x 1" Barb insert adapter.

Should look something like this (though don't forget to use stainless steel clamps on the pipe, which this guy hasn't put on yet):