Daldorado DalMAX™ DALMAX-FG-2424-WT 24" x 24" White Main Drain Frame and Grate - This Daldorado DalMAX™ series replacement Frame and Grate is for use with a 24”x 24” unblockable large area main drain. It is safety tested and certified to ANSI/APSP/ICC 16-2017 and is molded with quality PVC materials tested to ANSI/NSF/CAN 50 2020. With a large open area of 62%, DalMAX™ is the clear choice for every new commercial pool construction or large area main drain frame and grate replacement.