Standard Duty Metallic Ball Valve Pumps are ideally suited for intermittent / on-demand, portable, moderately abrasive fluids, and suspended solids. Standard Duty Metallic Diaphragm Pumps are constructed in Aluminum, Cast Iron, or Stainless Steel with TPE and PTFE options in elastomers. All models feature a no-lube, no-stall Air Distribution System for trouble free operation. Most models are capable of heads to 125 psi or 289 ft. of water, and max pressures to 125 psi.