The Liquid Controls M-Series Model M40 rotary motion positive displacement meter offers the ultimate in measurement accuracy for custody transfer of LPG, petroleum products, aviation fuels and a broad range of industrial liquids. The M-Series meets NTEP and International Weights & Measures accuracy requirements as well as U.S. Military specifications. Model: M40 Size: 4" Flow rate: 450 gpm (1700 lpm) Pressure: 150 psi (10.5 Bar) Temperature range: -40° F to 160° F (-40° C to 71° C) Viscosity rage: 30 SSU to 1,500,000 SSU (less than 1 centipoise to 325,000 centipoise Materials of construction: Aluminum, Cast Iron or Stainless Steel