The FDM 12×12 Square d-Box with SOLID lid comes complete with a black grate, and two seals that accept 2″, 3″, 4″, and corrugated pipe. You can choose your inlet and outlet heights, and it can accept one inlet and up to three outlets. All 4 inlet/outlet holes are precut. It will accept 6″ pipe however seal is sold separately.
FDM 12×12 Square D-Box (Solid Lid)