12" Low-Profile Adapter with Black Grate and 3"/4" Universal Locking Outlet. 

Includes:

• 1 ea - 1211 - 12"x12" Black Grate
• 1 ea - 1230 - 12" Low Profile Adapter
• 1 ea - 1243 - 3" & 4" Universal Locking Outlet
• Value: Less digging than 12" catch basin, high flow capacity
• 96 GPM Grate Flow Capacity
• Use in Lawns

NDS Drainage Grates Flow Capacities (pdf)
NDS Catch Basin & Grates Flow Capacities (pdf)