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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.

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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
500E 525-E-N3-002 525-E-AR-004 500E-AR 548-SE-N3-002

500-E Series

Neptune 500-E Series Hydraulic Metering Pumps offers an economical alternative to the standard 500 Series pumps or a packed plunger type pump.

Materials of Construction
  • 316SS
  • PVC
  • PVDF
Diaphragms
  • PTFE
Capacity
  • 2 gph (7.50 L/h) to 34 gph (129 L/h)
Max Pressure
  • 1,100 psi (75.8 bar)
Max Temperature
  • 316SS - 200°F (93°C)
  • PVC - 125°F (52°C)
  • PVDF - 125°F (52°C)
Standard Motor
  • 1/3HP-1ph-115VAC-60c-TEFC
logo_choice Select Your Pump
  • icon_cert-CE
  • American Petroleum Institute Logo

Features and Benefits

  • Ten turn micrometer dial calibrated in 1% increments, with the ability to adjust capacity from 10% to 100%
  • Variable Oil By-Pass™ Stroke Adjustment provides a better valve performance when compared to variable linkage designs
  • Bright color contrasted dial protected from corrosion by clear PVC Covering
  • Stroke mechanism moves only when adjustment is made, eliminating wear
  • Piston is powered through complete stroke length at all capacity adjustments, eliminating stress, wear and shock of lost motion designs
  • Totally enclosed fan-cooled motor with built-in automatic thermal overload