This Texsteam 5003 Series is a Piston type metering pump rated at 43 GPD and pressure ratings up to 12,000 PSI. 3/8" plunger size. Ductile iron fluid end standard with stainless trim and Buna-N packing and o-rings. All Stainless fluid end, Viton, TFE, High Pressure or Aflas Packing optional. High Pressure packing increases pressure rating to 12,000 PSI. For options not shown here please contact us.