Visual Flow Indicators

The Visual Flow Indicator (Model 202) is machined from a solid brass base for extended life and reliability. Our visual flow indicators are designed to save you money by allowing easy replacement of internal components that wear over time. 

 Just one glance shows you how everything is flowing! 


Sometimes called a flow sensor, a sight flow indicator, or a liquid flow indicator, the MPC Model 202 Visual Flow Indicator is a durable, efficient, and inexpensive device used to monitor liquid flow. A few of the most common applications for the water flow indicator include monitoring cooling water to welding and die casting machines. 

The movement of the multi-colored balls inside a clear lens mounted in a forged brass base readily indicates flow within the system. The visual flow indicator is designed for easy in-line or panel installation. The water flow indicator operates in all planes and positions, vertical and horizontal, providing visibility from virtually any angle. 

Key Features:

  • Low Cost
  • Sizes from 1/4" to 1" NPT
  • Solid brass alloy body
  • Clear, tough Lexan® liner and dome
  • Buna-N seals
  • Self-cleaning ball action 
  • Compact size 
  • In-line or panel installation
  • In Stock for quick delivery

Typical Applications:

  • Welding machines / tooling
  • Die cast machines / tooling
  • Plating industry 
  • Injection molding 
  • Extrusion machines 
  • Fire protection systems 
  • Automotive assembly 
  • Steel mills 
  • Paper mills 

Please ask about our spare parts option when placing your order!

Visual Flow Indicators General Spare Parts - Production Engineering

Available Models

Size (NPT)Part NumberOperating Range (GPM)
1/4 (Low Flow) 003046 .2 - 3
1/4 003048 .4 - .5
3/8 003049 1.5 - 7.5
1/2 003050 2.5 - 10
3/4 003051 4 - 15
1 003054 5 - 24
Repair Kit - I 003028 1/4 - 1/2 NPT
Repair Kit - II 003029 3/4 - 1 NPT

VFI Pressure Drop 

Visual Flow Indicators General Pressure Drop - Production Engineering

Typical Installation 

Visual Flow Indicators General Typical Installation - Production Engineering

The diagram above shows preferred installation to achieve maximum performance by mounting the VFI in vertical plane between a control valve and drain.