Legrand EFB6S-2HUB - Manual (Page 3)

Step 5. Insert Mounting Stud plate on the inside of the floor box. Place Cover
plate on the outside of the floor box. Position hub adapter onto the
protruding studs and fasten together using the supplied #10-32 nuts.
Step 6. Complete the installation by attaching 2 inch
conduit to the Hub.