PFA-120 Hole In the back ?

[tech101]

Hi I have a question about PFA-120.. There is a big hole in the back.. So My Question is how do you guys cover that for water tight seal ??

Am I Missing something ?

I am using this with Corner mount PFA 151

 

[SkyLake]

You can use a conduit hole seal.

https://www.amazon.com/Hoffman-Stainless-Steel-Conduit-Hole/dp/B07J2VYBVC

I don't know the size right now.