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


MIxers / Agitators
Cooling Towers
Low-Flow Applications


Steady-State Operations
High Humidity

HydroGuard Breathers

Did You Know…

Contamination Control

Moisture contamination is the second most destructive contaminant in most systems?


The “one size fits all” approach is not ideal when it comes to selecting breathers? It is best to find the right fit for each particular application.

New oil

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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
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

HydroGuard Breather Cut Thru


Model Unit Height
(in / mm)
Unit Diameter
in / mm)
Connection Size Amount of Silica Gel
(lbs / kg)
Adsorption Capacity
(fl oz / ml)
Max. Flow Rate
Max. Flow Rate
Filter Efficiency Operating Temp. Range (°F) Operating Temp. Range (°C)
DC-HG-1 7.19 / 182 2.52 / 64 3/8″ Multi-Fit (NPT, BSPP, BSPT)” 0.3 / 0.1 2 / 50 1 @ 1 psid 40 3µ absolute (β₃≥200) -20° to 200° -29° to 93°
DC-HG-8 9.73 / 247 4.10 / 104 1″ Multi-Fit (NPT, BSPP, BSPT)” 0.8 / 0.4 5 / 144 7 @ 1 psid 198 3µ absolute (β₃≥200) -20° to 200° -29° to 93°
Model Max. Airflow at
1 psid (gpm/lpm)
Gearbox/Storage Tank
Max. Volume (gal/L)
Hydraulic Reservoir
Max. Volume (gal/L)
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.

Part Number Description
DC-18 1″-1/4″ Brass Threaded Reducer/Adapter
DC-12-T Threaded Flange Adapter
DC-12-TG Threaded Flange Adapter with Gasket
DC-15-T Bayonet Adapter
Download Technical Specifications

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