NDS 1813 - 18x18 Cast Iron Square Catch Basin Grate

Designed for professional drainage installations, the NDS 1813 is an 18x18 cast iron square catch basin grate engineered for durability and high flow capacity. It fits standard 18 in. catch basins and provides reliable debris protection for lawns, driveways, patios, and landscaped areas.

• Material & finish: Heavy-duty cast iron, painted black for shipping; will form protective iron-oxide patina over time.
• Dimensions & weight: Actual size 16 7/8" x 16 7/8" x 1"; weight 46 lb for solid, stable installation.
• Flow & open area: 100.63 sq in open surface; up to 478.92 GPM at 1" head (see tech spec for full flow table).
• Load rating: H-20 (Class C) load rated when properly installed in concrete; suitable for autos and light trucks.
• Compatibility: Fits NDS 18 in. catch basin series including models 1882, 1884, 1800, 1804, 1816, 1830, and 1840.
• Grate opening: 1" x 3" slot pattern helps block debris while allowing rapid drainage.

With robust cast iron construction and an H-20 load rating, the 1813 grate balances strength and flow performance for residential and commercial surface drainage. Refer to the NDS spec sheet for installation details and load-rating guidance before use.