Daldorado DalMAX™ DALMAX-FG-1854-WT 18" x 54" White Main Drain Frame and Grate - This Daldorado DalMAX™ series replacement Frame and Grate is for use with an 18”x 54” 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.