What size Split Nut do I need to repair this? 1.41" (36mm)

[DIYinATX]

Hi, this connection holds a "button" that turns on/off my whirlpool.

This is the original nut --
1.41" (36mm)

And this is where it goes:

 

[Reach4]

If that is a pipe thread, that would be 1 inch NPT I am thinking. That would be about 1.3 inches. The next size up, 1-1/4 would be 1.66 inches.

So it may not be pipe thread.

 

[Sponsor]

 

[DIYinATX]

Thanks, yeah I'm pretty sure it's not NPT because it looks more like machine-screw tightness to me.
It's that plastic pipe in the middle of the pic above, btw.
You can see it's already got some mildew or something from the nut being loose (broken), leaving a loose surface for water to get through from the top.

 

[DIYinATX]

Better picture of the plastic "screw" and broken plastic nut.