How do I mate conduit neatly to an Underground Pull box?

[Installer]

I have to mate an existing buried 2" Rigid conduit with conductors to a new 8 foot run of buried 2" Schedule 80 PVC. conduit.
This is happening in an empty fenced field.
The two sections of conduit have to be joined in an underground enclosure. I found this:
Carson™ Light Duty Underground Enclosure Assembly, HDPE, 14 x 19 x 12".
What fitting do I need to mate the 2" RGS conduit to the box?
What fittings do I use to mate the 2" schedule 80 conduit to the Box?
Or should i find something better?

 

[electrofelon]

Normally you wouldn't mate the conduits to the box, they would just end a couple inches inside.