Beer tower nut size

[Iceman6409]

Hey all. Just finished attaching the beer line to the shank in a single tap beer tower. So far I have been able to finger tighten the nut inside the tower but now realize I need a nut wrench to do this as it is very very tight in there with next to no room to work with. Been doing some research and I see 2 wrench sizes - 1" and 1 1/16". I have zero desire to disassemble this tower to figure out the nut size. My questions is is it a standard 1 1/16" or is there a possibility it could be a 1"?

 

[kev211]

What shank do you have? Got any calipers you can shove in there?

 

[mazultav]

https://www.homebrewing.org/Draft-Arm-Wrench_p_5431.html

Both options.