C Series stainless steel centrifugal pumps from MTH Pumps have a cast stainless steel semiopen impeller with a trimmed face to provide varying performance curves. This enables a specific pump size to have varying design flow rates while preserving high head at low flow. The casing’s impeller clearance allows slight adjustment of flow without installing a valve in the discharge line. This adjustment can also be used to restore loss of performance due to wear without dismantling the pump. It operates in the 10 to 20 gpm range at 130 feet total dynamic head (TDH), while delivering up to 100 gpm maximum flow and 140 feet maximum TDH. 630/552-4115; www.mthpumps.com.