• Optional control valve
    • King 7520 (no valve)
    • King 7530 (with valve)
  • Flow capacity
    • 7GPH to 20GPM (water)
    • 2.6 SCFH to 60 SCFM (air)
  • Maximum pressure
    • 125 psig (water)
    • 100 psig (air)
  • Maximum temp
    • 130°F (54°C) for liquid
    • 100°F (38°C) for gases
  • 33 to 125°F (1 to 52°C) ambient temp
  • 10:1 turndown unless otherwise indicated


The King Instrument 7520 / 7530 series rotameters feature horizontal mounting connections for ease of installation and panel-mount capability. Utilizing a float and tapered tube design, these variable area flow meters have longer, more linear scales, better pointer stability, and greater accuracy than competitively priced products.

Precision machined from durable cast acrylic stock, these King rotameters have brass or 316L stainless steel internal components and fittings. King flow meters are available in a variety of scales for increased accuracy and repeatability; these range from 2 to 10 inches (50 to 250mm).


This product can be used in the following applications:

In Stock

Part Number Fitting Material Media Max Flow (STP Conditions) Price Available
316L stainless steel
Water (GPH, GPM)
22 GPH
$145.00 2 in stock

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