4" BLK Atrium Grate

NDS PRO 4" Black Atrium Grate is a flat top structural foam polyolefin atrium grate with UV inhibitor. It has an open surface area of 17.00 Sq.In. and a flow rate of 52.01 gpm. It fits 4" sewer & drain pipe & fittings, 4" corrugated pipe, & 4" triple wall pipe. It is made of plastic and has a black finish. It has a limited lifetime warranty.