18 x 18 Inch SuperFlow Main Drain Grate Only 816 GPM (Package of 2) filter-length_18 9/16 inches This clarity measurement is required

This clarity measurement is required by the majority of state health boards for swimming pool safety

and SP1421 Series Skimmers

This Spa Closed Do Not Enter Sign has 4 inch lettering

This Eaton Hayward Model 30R Simplex Basket Strainer has 8 inch flanged ends

18 x 18 Inch SuperFlow Main Drain Grate Only 816 GPM (Package of 2) filter-length_18 9/16 inches This clarity measurement is requiredThis is an 18 x 18 inch 816 GPM replacement Main Drain Grate Only. This comes as a pack of two. The domed SuperFlow main drain grating is unique since it has the capability to maintain a flow rate of 816 GPM (18 x 18 inches). Includes grate (cover only) and screws. This anti entrapment cover is VGB compliant and certified to the APSP ANSI ICC 16 2017 standards.