Lawson SuperFlow - Large 18" x 36" Frame and Grate + Screws, Floor 2080 GPM $1,199.08 Lawson SuperFlow - Domed Frame and Grates - 18" x 36" Frame and Grate with Screws, Floor 2080 GPM Only Lawson Aquatics, Inc. has SuperFlow Frame and Grates NSF LISTED and VGB-2008-certified... Add to Cart