Filter Indicators Overview - Differential Pressure Plus
Differential Pressure Plus manufacturers differential pressure gauges for monitoring filter status, liquid level, flow rate measurement in venturis, and much more.
differential, pressure, gauge, filter, status, midwest instrument, orange research, wika, ashcroft, delta, manometer, venturi, liquid level, measurement, dpp, plus, 200DPG, DPP975, filtershield
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Direct Mount Indicators
These specialty products bolt directly into
into a filter head. They use o-ring seals
and are very easy to engineer into a design!
Push Connect Gauges
Innovative differential pressure gauges
that use push connect fittings
for quick installation
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Lead Times

Customer Service

Bolt On Style

We’ve been building these simple filter indicators for nearly 30 years! They’re trusted by OEMs around the world and provide a visual of the condition of a cartridge. These  designs use a standardized 1.75″ bolt pattern that connects to a filter head.

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

1/8" NPT

Like the design of our bolt on or screw on indicators but don’t have a compatible filter? No problem, you can use one of our special anodized aluminum mounting bases which converts them to 1/8″ NPT connections. They’re perfect for remote monitoring.

Universal Mounting

The bolt on and screw indicators allow users to mount the gauge in either direction. This is critical to any system because it allows the differential to be monitored in either flow direction.

Filter Indicator Models


Simple bolt on indicator that is interchangeable with DPP975. Seals by two o-rings onto filter head.


Gauge style filter status indicator. Interchangeable with DPP175. Diaphragm sensing element. Can be outfitted with electrical switch for remote notification.

Trusted By OEM's

Ensure safety and performance of your company’s filter designs by integrating an indicator. Without a visual, operators can have a difficult time knowing when to change the cartridge.

Stop forgetting to change your filter! Our indicators make sure you know the status without having to close the system down. This reduces down time and prevents potential failures.