Rain Bird® DG7USB 7" Black Plastic Square Universal Drain Grate is used for grass areas, flower beds, decks, driveways, golf courses, medians, etc. The square universal grate can be used with 3" and 4" Sewer and drain pipe (ASTM D2729), 3" and "4 corrugated pipe, 3" and 4" triple wall pipe, 6" sewer and drain fittings (SDR 35), and a 6" round catch basin. Grate is designed to withstand pedestrian traffic.