4" GRN Atrium Grate

NDS 4" Green Polyolefin Flat Top Atrium Grate is made of structural foam polyolefin with UV inhibitors. It 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. It comes with a limited lifetime warranty.