ENPRESS LLC’s Vortech(TM) bottom distributor, plate-equipped, light commercial vessels are available in all seven- through 16-inch (177.8-406.4 mm) diameters. The 16-inch version can be used with all distributor pipe sizes up to two inches (50.8 mm). These vessels feature an exclusive internal bottom plate distributor, self-cleaning nozzle design and permanent attachment of the riser. Elimination of gravel under-bedding reduces overall cost and shipping weight, backwash flow rates can be reduced by a minimum of 30 percent and flow dynamics are improved by more than 40 percent. http://www.enpress.com(866) 859-9274