Not Available Not Available Drainage System Overview Catch Basin Installation
NDS-1816 8 " Riser for 18" Catch Basin: Use with 18" x 18" Catch Basin Series. Riser package includes 4 sides. Use with NDS-1800 or NDS-1804 catch basins. **Assembly requred** ** BEFORE installing a drainage system, please check your local codes and regulations and install accordingly. ** Specifications 8" Riser for 18" x 18" Catch Basin. To learn more about general drainage and catch basin installation, please watch the videos below:	*Note: All dimensions are nominal. NDS 18 Inch Catch Basin & Riser Models: NDS-1800 18" x 18" Two-Outlet Expandable Catch Basin NDS-1804 18" x 18" Four-Outlet Expandable Catch Basin NDS-1816 8" Riser for 18" x 18"" Catch Basin Compatible Grate Models: NDS-1881 Black 18" Atrium Drainage Grate NDS-1891 Green 18" Atrium Drainage Grate NDS-1811 Black 18" Square Drainage Grate NDS-1812 Green 18" Square Drainage Grate