When your catch basin outlets deeper in the ground, use the National Diversified Sales 101R 6" Black Riser for 6" Round Spee-D® Catch Basin Drain to reach up and capture stormwater from the surface. The durable extension adds 2" to 6" to the top of the basin, eliminating the hassle of regrading or awkward piping; use cut guides to cut to size and easily get the height you need. The riser works with the 6" round Spee-D catch basin and is compatible with all drainage grates or drain covers that fit the Spee-D basin, such as the 6" round and square brass grates, 6" and 8" round plastic grates, 6" atrium plastic grate, 6" square grate and adapter, and 7", 8", and 9" square plastic grates. Made of high-impact polystyrene (HIPS) treated with UV inhibitors. Hassle-free limited lifetime warranty guarantees the NDS product is free from defects—or we’ll replace it.