Eureka Manufacturing's ASME A112.19.8-2007 certified Anti-Entrapment Drain Cover 20" x 20", for up to 12" x 12", 223 GPM at 1.5 fps (maximum allowed GPM). Anti-Entrapment Drain Covers are easy to install and feature a gradual slope with a low profile, an anti-vortex design which prevents air from entering the pump, and is constructed of durable, low-carbon 12 gauge S.S. to last up to 20 years.