Storm Drain 20" Round Catch Basin Drain Box With Solid Lid (1) Use as Rain Drain, Drain Box, D-Box, or Drop Box; allows for all configurations Use as a rain drain for gutters, driveways & sub surface drainage Use as a distribution box or drop box for onsite septic systems Use with the riser to bring cover or grate to grade as needed Accepts 2" inch, 3", 4" Sch. 40, S&D and corrugated pipe