Liberty Pumps’ X-Series features heavy cast-iron sewage and effluent pumps, designed specifically for use in hazardous locations. The XFL Series (pictured) and XLE Series are available in 1/2 and 3/4 hp. Both series’ feature a dual-sized discharge, two-vane semi-open cast-iron impeller (bronze optional), epoxy powder-coat finish, dual silicon-carbide shaft seals with seal fail sensor and stainless-steel fasteners. ISS Series- and ISD Series control panels have been added for use with these pumps. Liberty Pumps.