Vertical turbine pumps from Wolf Pumps feature a cast iron discharge case and a bowl shaft that is either stainless steel or chrome plated. Cast iron discharge head assemblies range from 3 inches to 10 inches. The impeller is bronze, balanced to reduce vibration, and either semi-open or enclosed. These pumps are available in capacities from 75 gpm to 3,500 gpm, with bowl sizes from 6 inches to 15 inches. Wolf Pumps, Card No. 320