No Sump Required - No need to chisel out a sump to meet the1.5 times the pipe diameter sump depth requirement. SDX has a 1.485 feet per second velocity at the opening at a maximum listed 200 GPM. SDX is a high flow suction outlet suitable for use as a wall fitting and also as a floor drain when debris removal is not a concern. A Retro version is available to bring existing suction outlet covers into compliance with the new law. SDX Retro fits existing plaster rings up to 10" in diameter. SDX boasts a flow rating of 200 GPM on the floor and 192 GPM on the wall making it compatible with most residential pumps up to 3 HP. SDX has a 1.485 feet per second velocity at the opening at a maximum listed 200 GPM.