Made of highest quality structural foam polyethylene with UV inhibitor. May be used in turf or concrete applications such as lawn areas, walkways, patios and pool areas where effective surface water removal systems are required. Grates fit directly into Sewer & Drain pipe or fittings and Corrugated pipe without the use of a coupling. Not for use in areas subject to vehicular traffic. Fits 6 in corrugated single wall and dual pipe, SDR 35, 2729 S&D and Triple Wall pipe. 18.9 sq-in open surface area. 1/4 in grate opening. 0 to 60 psi. (BLACK) Can also be used with 6 in round catch basins. ADA compliant.