S217 vs S765

[jproaster]

Can't believe I haven't obtained my couplers and plugs for a.c. yet.
Anyhow, I can't seem to find a simple understanding of the difference between these two couplers.

And, what does the "n" stand for in "mnpt" or "fnpt"?

Thanks

 

[rijndael]

n = national

 

[jproaster]

So, "male/female national pipe thread"

Thanks

 

[stonesfan68]

So, "male/female national pipe thread"

Thanks

Yes, that's correct.

 

[jproaster]

I know that I haven't waited too long in asking about couplers.
But,
Does it matter which of the above I choose?

Thanks.