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DPP975 The DPP975’s simple modular design allows the gauge to accommodate many different options.


Differential Pressure Plus designs and manufacturers differential pressure gauges and filter indicators. Our main industries are cyrogenic storage for liquid oxygenm nitrogen, and natural gas. Filtration of water, oil, and other gases and liquids. Leak detection systems for large tanks and pipelines. Flow rates on venturis and other flow type devices. We are located in the United States and have been manufacturing since 1991. We also make a like of 4-20mA transmitters and entire line of testing equipment. Our backflow test kits are used to test back flow preventers around the world

Differential Pressure Gauges

Backflow Test Kit

Backflow Equipment

Video Series 

Options and Accessories 

Electrical Switch Options

Three Color Bands


Liquid Filled Dials

Filter Head Mount Kits

Dial Sizes and Types

Max Indicating Pointers

Mounting Brackets

Transmitter Outputs

Product Overviews 

Backflow Equipment

DPP977 and DPP175

Fluid Dynamics Lessons 

Rethinking Venturis

Deriving the Bernoulli Principle

Quick Calibration Tip