EM Series electric diaphragm, positive displacement pumps for municipal sludge transfer from ABEL Pumps offer low operating costs and durability. High-efficiency electric drive and slow stroke rates keep energy bills low and wear parts cost to a minimum. Mechanical simplicity makes seldom-needed maintenance easy. The construction includes integral metal core membranes and a smooth, mechanically controlled linear drive. Large ports and valve clearances make even the highest solids content sludge easy to pump. True process control is achieved via an optional variable-frequency drive. Optional discharge dampeners and suction stabilizers are available to minimize flow pulsations under variable or demanding system conditions. 412/741-3222; www.abelpumps.com.