Help with combiner box

[Bigfoo171]

Midnite solar MNSR-1000

Do I have to buy the nut to install this on my container box?
Thank you for reading this and give me your input

 

[fromport]

Midnite solar MNSR-1000

Do I have to buy the nut to install this on my container box?
Thank you for reading this and give me your input

https://www.lowes.com/pd/Sigma-Electric-ProConnex-3-4-in-Conduit-Locknut-Intermediate-Metal-Conduit-Compatible-Galvanized-Rigid-Conduit-Compatible-Rigid-Metal-Conduit-Compatible-Conduit-Fitting/1100175

something like that probably works.
My guess is it is a 3/4", adjust accordingly

 

[400bird]

The website says "nut is included" at the bottom of the product listing.

 

[fromport]

The website says "nut is included" at the bottom of the product listing.

View attachment 121035

The picture does not show a nut. But yes, see what they think of that. Ask midnite solar and let us know.