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Neptune G-50-1A-LP 50 Gallon Glycol Feeder

Sale price $5,318.79 Regular price $6,447.00

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Product Overview

The Neptune GFS-50-1A-LP 50 Gallon Glycol Feeder is an automatic fluid replenishment system designed to maintain proper pressure and fluid levels in closed-loop heating, cooling, and industrial process systems. Built for reliable operation in commercial and industrial environments, this feeder helps protect equipment, improve system efficiency, and reduce maintenance requirements. Featuring a durable 50-gallon reservoir and low-pressure configuration, the unit serves as an effective glycol make-up unit for facilities requiring consistent fluid management and dependable system protection.

Why Choose the Neptune GFS-50-1A-LP?

Closed-loop systems rely on proper fluid volume and pressure to maintain optimal performance. The Neptune GFS-50-1A-LP automatically replenishes lost fluid and helps prevent issues caused by low pressure, air infiltration, and insufficient fluid levels.

Key Benefits

✔ Automatically maintains system pressure

✔ Reduces manual monitoring requirements

✔ Helps prevent corrosion and equipment damage

✔ Supports consistent heating and cooling performance

✔ Durable 50-gallon storage capacity

✔ Ideal for commercial and industrial facilities

✔ Reliable low-pressure operation

✔ Helps extend equipment lifespan

Key Features

50-Gallon Polyethylene Reservoir

The heavy-duty tank provides ample storage capacity for glycol solutions and make-up fluid, helping minimize refill frequency and support continuous operation.

Automatic Pressure Maintenance

The integrated feed system automatically delivers fluid when system pressure drops below desired operating levels, helping maintain system stability and efficiency.

Low-Pressure Configuration

Designed for applications requiring lower operating pressures, the GFS-50-1A-LP offers dependable performance while protecting sensitive equipment and piping systems.

Commercial-Grade Construction

Manufactured by Neptune, this feeder is built to withstand demanding HVAC and industrial operating environments while delivering long-term reliability.

Easy Maintenance Design

The accessible reservoir and straightforward operation simplify maintenance and routine inspections for facility personnel.

Common Applications

The Neptune GFS-50-1A-LP is commonly installed in:

HVAC Systems

  • Chilled water systems
  • Hydronic heating systems
  • Heat pump systems
  • Closed-loop HVAC applications

Commercial Facilities

  • Office buildings
  • Hospitals
  • Hotels
  • Educational institutions

Industrial Facilities

  • Manufacturing plants
  • Process cooling systems
  • Temperature control applications

Institutional Buildings

  • Universities
  • Government facilities
  • Healthcare campuses
  • Large commercial complexes

Technical Specifications

Specification Details
Model GFS-50-1A-LP
Manufacturer Neptune
Tank Capacity 50 Gallons
Tank Material Polyethylene
Configuration Low Pressure
Application Closed-Loop Systems
Fluid Compatibility Glycol Solutions & Water
Operation Automatic Feed System
Installation Type Commercial & Industrial

Which Model Is Right for Your Facility?

System Size Recommended Model
Large Commercial Facilities GFS-50-1A-LP
Industrial Process Systems GFS-50-1A-LP


The GFS-50-1A-LP is often selected for facilities that require larger fluid reserves and reliable low-pressure replenishment capabilities.

How a Glycol Feed System Works

A glycol feed system automatically monitors system pressure and introduces additional fluid whenever pressure drops below acceptable operating levels. This process helps maintain proper fluid volume, reduce air infiltration, and improve overall system performance.

By maintaining stable operating conditions, facility managers can reduce maintenance costs, improve equipment reliability, and support long-term operational efficiency.

Ideal For

This model is commonly selected by:

  • Mechanical contractors
  • HVAC professionals
  • Facility managers
  • Building engineers
  • Industrial maintenance teams
  • Water treatment specialists

Need Help Selecting the Right Glycol Feeder?

Not sure if the Neptune GFS-50-1A-LP is the right solution for your application?

Our specialists can help you:

  • Select the proper feeder size
  • Determine reservoir capacity requirements
  • Recommend compatible accessories
  • Provide volume pricing
  • Answer installation questions

👉 Request a Quote Today

Or call (623) 624-5662 to speak with a product specialist.

Frequently Asked Questions

1. What is the purpose of the Neptune GFS-50-1A-LP?

The unit automatically maintains fluid levels and pressure in closed-loop systems, helping improve efficiency and protect valuable equipment.

2. What does the LP designation mean?

LP indicates a low-pressure configuration designed for applications where lower operating pressures are preferred.

3. Can this system be used with glycol solutions?

Yes. The feeder is designed for glycol-based solutions as well as water-based closed-loop systems.

4. Is this feeder suitable for chilled water applications?

Yes. It is commonly used in chilled water, hydronic heating, and industrial cooling systems.

5. How does automatic fluid replenishment benefit a system?

Automatic replenishment helps maintain proper pressure, reduce air infiltration, and improve equipment reliability without constant manual monitoring.

Download Resources:

Click here to view the data sheet.

Click here to view manual.

Actual product may differ from what is shown.