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Des-Case 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.

Des-Case HydroGuard Breather Range


  • 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

1 Domed Cap

A domed cap allows for better washdown runoff

2 Expansion Chamber

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

3 External Ribs

External ribs on shell to create greater durability and grip when installing or replacing breather

4 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

5 Integrated Drip Ring

An integrated drip ring keeps shedding water from entering the vent holes

6 Threaded Mounting

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

7 Larger, High-Capacity Check Valves

High-capacity check valves allow for increased airflow at low cracking pressure

8 Filter Element

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

9 Enhanced Seal

An enhanced seal eliminates potential for airflow bypass


Product Specs DC-HG-1 DC-HG-8
Unit Height (in / mm) 7.19 / 182 9.73 / 247
Unit Diameter (in / mm) 2.52 / 64 4.10 / 104
Connection Size 3/8" Multi-Fit (NPT, BSPP, BSPT) 1" Multi-Fit (NPT, BSPP, BSPT)
Amount of Silica Gel (lbs / kg) 0.3 / 0.1 0.8 / 0.4
Adsorption Capacity (fl oz / ml) 2 / 50 5 / 144
Max. Flow Rate (cfm) 1 ° 1 psid 7 ° 1 psid
Max. Flow Rate (lpm) 40 198
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 Suction / Return Rate (gpm / lpm)
Gearbox / Storage Tank Reservoir Max Volume (Gallons /Litres) Hydraulic Reservoir Max Volume (Gallons /Litres)
DC-HG-1 11 / 40 50 / 189 N/A
DC-HG-8 52 / 198 400 / 1514 55 / 208

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

Reduce downtime & improve reliability

We can also provide independent advice about your oils through modern oil analysis techniques.

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