HydroGuard® Breathers

Des-Case HydroGuard® breathers uniquely feature an expansion chamber and internal check valves that create a nearly-sealed system. Designed specifically for steady-state operations with minimal temperature fluctuations, these breathers provide excellent protection in continuous duty applications.

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Product Specs

Unit Height (in / mm) 7.22 / 183 9.75 / 247.66
Unit Diameter (in / mm) 2.52 / 64 4.1 / 104.1
Connection Size 3/8" Multi-Fit (NPT, BSPP, BSPT) 1" Multi-Fit (NPT, BSPP, BSPT)
Amount of Silica Gel (lbs / kg) 0.28 / 0.125 0.65 / 0.24
Adsorption Capacity (fl oz / ml) 1.68 / 49.6 4.05 / 120
Max. Flow Rate (cfm) 1.41 @ 1 psid 2.5 @ 1 psid
Max. Flow Rate (lpm) 39.93 70.5
Filter Efficiency 3µ absolute (β₃≥200) 3µ absolute (β₃≥200)
Operating Temp. Range (°F) -20° to 200° -20° to 200°
Operating Temp. Range (°C) -29° to 93° -29° to 93°
Model Max. Airflow at 1 psid  Recommended Max. Volume
Gearbox / Storage Tank Hydraulic Reservoir
DC-HG-1 1.41 cfm / 39.93 lpm 50 gal / 189 L N/A
DC-HG-8 2.5 cfm / 70.5 lpm 400 gal / 1514 L 55 gal / 208 L

Please Note: This is intended as a general guideline for sizing only; other considerations, such as: humidity level, frequency of air flow, ambient temperatures, and chemical compatibility are very important in sizing a breather properly. Larger applications and special circumstances typically require the most thorough analysis. Please contact Des-Case for assistance in sizing a breather.


  • Steady-State Operations
  • Gearboxes
  • High Humidity
  • Washdowns
  • Low Flow Applications

As wet, contaminated air is drawn through the unit, multiple 3-micron polyester filter elements remove solid particulate while the color-indicating silica gel extracts moisture. The diaphragm allows for expansion/contraction of the air within the casing as a result of temperature variations during steady-state operations. When air is expelled from the container, the top foam pad prevents oil mist from contacting silica gel or entering the atmosphere.


Seeing Pink?

A pink breather means it has done its job keeping moisture out of your lubricants. Time to replace the breather with a new one.

Description Part Number
1" FNPT x 1" Slip Fit Adapter DC-10-S
1" Threaded Adapter DC-10
1" Male Threaded x 1" Female Threaded Adapter DC-10-T
Field Flange Adapter-Slip Fit (DC-HG-8 only) DC-12-S
Bell Reducer 1" to 3/4"-Slip Fit DC-17
1"-3/4" Female to Male Threaded Adapter DC-17-T
1"-1/4" Brass, Threaded Reducer/Adapter DC-18
Threaded Flange Adapter DC-12-T
Threaded Flange Adapter with Gasket DC-12-TG
Bayonet Adapter DC-15-T
  • Removes moisture in the headspace of equipment
  • Eliminates rust-forming condensation
  • Prevents sludge deposits and water-contaminated oil
  • Prevents contamination ingress
  • Provides longer lubricant life
  • Reduces wear and tear on equipment, prolongs life
  1. What is the application?

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