Neptune Products

Delivering accurate, precise and quality solutions

Neptune's technical innovations, backed by solid customer support, builds confidence in our complete portfolio of products, delivering peace of mind reliability to our end users.

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ProTips Education Center

Single-Source Resource for Industrial Water Treatment

New educational center dedicated to providing you with resources, best practices and product information for the industrial water treatment market.

Check out our ProTips

Neptune Markets

Single-source, end-to-end solutions

Neptune delivers pump systems for use in the reliable and safe handling of chemical fluids used for water treatment applications in municipalities, general industries and agriculture.

View Our Markets

ProTips Education Center

Single-Source Resource for Industrial Water Treatment

New educational center dedicated to providing you with resources, best practices and product information for the industrial water treatment market.

Check out our ProTips

Neptune Hydraulic Metering Pumps

Neptune is a premier manufacturer of hydraulic and mechanical metering pumps. Since 1961, Neptune has been delivering accurate, precise and quality solutions for a variety of industries, including agriculture, oil and gas exploration, power generation, chemical processing, and water/wastewater treatment. Whether you’re looking for metering pumps that can handle high viscosities or high pressures, large or small capacities, or just reliable technology, Neptune has the solutions you need to meet your unique application requirements.

Principles of Operation

When determining which metering pump is the best option for a specific application, there are a number of variables that must be taken into consideration, including:

  • Flow Rate/Discharge Pressure
  • Materials of Construction
  • Chemical Makeup

For a complete list and description of considerations for choosing the correct metering pump for your needs, download our helpful Sizing and Selecting Metering Pump Guide.

Find Your Nearest Distributor

500 Series

  • Simplex Design (Duplex Available)
  • 0.80 gph to 188 gph
  • Maximum pressure 3000 psi
  • Available liquid end materials:
    • 316SS
    • PVC
    • C20
    • Kynar

5005/5003 Series

  • Simplex Design (Duplex Available)
  • 0.35 gph to 1.0 gph
  • Maximum pressure 3000 psi
  • Available liquid end materials:
    • 316SS
    • PVC
    • C20

600 Series

  • Simplex Design
  • 130.0 gph to 240 gph
  • Maximum pressure 600 psi
  • Available liquid end materials:
    • 316SS
    • PVC
    • C20
    • Kynar

6000 Series

  • Simplex Design
  • 4.5 gph to 28.0 gph
  • Maximum pressure 4000 psi
  • Available liquid end materials:
    • 316SS