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.


  • Oil & Gas
  • Wind Energy
  • Pulp & Paper
  • General Manufacturing
  • Aviation


  • Gearboxes
  • Mixers / Agitators
  • Cooling Towers
  • Low-Flow Applications


  • Steady-State Operations
  • High Humidity
  • Washdowns


HydroGuard Breather Cut Thru

Expansion Chamber

The diaphragm allows for expansion/contraction of the air within the casing as a result of temperature variations during steady-state operations.

Foam Pad

Foam filter captures any oil mist and disperses incoming air evenly over filtration and drying area.

Integrated Nylon Standpipe

The integrated standpipe provides excellent vibration resistance and dissipates impact throughout the unit, eliminating weak points. It also allows even airflow distribution throughout the unit, eliminating inaccurate readings of desiccant saturation.

Water Adsorbent

Silica gel adsorbs water from incoming air and can hold up to 40% of its weight. Condition is indicated by change of colour from blue to light pink.

Recessed Check-Valves

High-quality umbrella check-valves that won’t clog or stick are recessed underneath the unit for added protection from washdown environments. Check-valves isolate equipment from ambient conditions, prolonging breather life.

Filter Element

Polyester filter element removes airborne contamination to 3-micron absolute. Unique loops allow particles to release during system exhalation, helping to increase breather life.

Resilient Polycarbonate Body

Shock-absorbing, clear casing provides reliable service and easy maintenance.

Threaded Mounting

Easily replaces standard filler/breather cap with multi-fit connection or one of several adapters.


As wet, contaminated air is drawn through the unit, multiple 3-micron polyester filter elements remove solid particulate while the colour-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.

Time to replace your standard breather


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 (ß3≥200) 3µ absolute (ß3≥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.

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