NDS 4" Green Polyolefin Flat Top Atrium Grate. It is made of structural foam polyolefin with UV inhibitors for durability. This grate has an open surface area of 14.50 Sq.In. and a flow rate of 19.00 gpm. It fits 4" sewer and drain pipe and fittings, 4" corrugated pipe, and 4" triple wall pipe. Comes with a limited lifetime warranty.

• 4 in. Green Flat Top Structural Foam Polyolefin Atrium Grate with UV inhibitors.
• Open surface area of 14.50 Sq.In.
• Flow rate of 19.00 gpm.
• Fits 4 in. sewer and drain pipe and fittings, 4 in. corrugated pipe, and 4 in. triple wall pipe.
• Ideal for planter beds, mulch areas, window wells & areas prone to debris collection