Keep Moisture Out. Keep Equipment Running.
Every time fluid levels shift or internal temperatures change, industrial equipment draws in ambient air; pulling with it moisture, dust, and particulate contamination that silently degrade lubricants, corrode surfaces, and accelerate wear. Desiccant breathers replace standard vent caps to filter and dry this incoming air before it reaches the reservoir, extending fluid life and protecting critical equipment.
The range covers standard, extended, extreme-duty, and rebuildable configurations; including descase breathers; with silica gel desiccant, 2-3 micron particulate filtration, colour-change saturation indicators, and NPT connections across sizes suited to small reservoirs through large tank farms.
Dutco Tennant LLC supplies contamination control and lubrication protection solutions across the UAE and GCC, serving oil and gas, power generation, manufacturing, marine, and water treatment operations.
The First Line of Defence Against Fluid Contamination
- Standard OEM vent caps filter only to 10-40 microns; desiccant breathers deliver 2-3 micron absolute particulate filtration, removing contaminants that cause bearing and seal wear
- Colour-indicating silica gel changes from blue to pink when saturated, providing a clear visual cue for replacement without dismantling the unit
- Integrated standpipe and foam pad capture oil mist on exhalation, preventing lubricant loss and keeping desiccant uncontaminated
- Internal check valves on select models restrict airflow to actual demand, reducing unnecessary air exchange and extending desiccant service life
- Chemical-compatible housings in PC/PBT alloy, carbon steel, and stainless steel handle exposure to fuels, solvents, salt air, and wash-down environments
Built-In Features That Maximise Protection
- Multi-Stage Filtration: Incoming air passes through a polyester pre-filter, silica gel desiccant bed, and secondary filter element before entering the reservoir; blocking both moisture and particles in a single pass
- Colour-Change Saturation Indicator: Sight glass on the housing allows desiccant condition to be checked from a distance without removing the unit from service
- Check Valve Technology: One-way valves in extended and extreme-duty models limit air ingress to what the system actually requires, significantly reducing moisture load in humid environments
- Replaceable Desiccant Cartridges: Rebuildable steel descase breathers allow cartridge swap-out without replacing the full housing, reducing long-term maintenance costs on high-volume installations
- Activated Carbon Option: Select configurations incorporate activated carbon alongside silica gel to control fumes and odours in fuel, solvent, and chemical storage applications
Types
Standard Series Desiccant Breathers
Desiccant breathers for oil tanks and hydraulic reservoirs in general industrial use, providing dependable moisture and particulate protection in a compact, drop-in replacement for OEM vent caps.
- Silica gel desiccant with 3-micron absolute particulate filtration for reservoirs up to 500 gallons
- Multi-fit NPT, BSPT, and BSPP connection options for compatibility across standard reservoir port sizes
- Operating temperature range of -29°C to 93°C for indoor and outdoor industrial environments
Extended Series Desiccant Breathers
Extended models offer greater desiccant volume and dual-stage filtration for larger reservoirs and higher air-exchange applications where standard units reach saturation quickly.
- Increased silica gel capacity handles reservoirs up to 1,000 gallons in gearbox and storage tank applications
- Secondary polyester filter element prevents desiccant dust migration into the reservoir during high-flow cycles
- Check valve versions available for intermittent-operation systems with low ambient airflow requirements
Extreme Duty Desiccant Breathers
Automotive-grade PC/PBT alloy housing and solid standpipe construction make extreme-duty units the preferred choice for mobile equipment, high-vibration machinery, and outdoor installations.
- Impact and chemical-resistant housing rated from -40°C to 149°C for the most demanding field conditions
- Dual sight-glass windows allow desiccant condition monitoring from multiple angles on mobile and elevated installations
- Desiccant breathers for gearboxes in wind turbines, cranes, and mining equipment where vibration and temperature cycling are severe
Rebuildable Steel Breathers
Heavy-gauge carbon steel and stainless steel rebuildable units serve high-flow tank farm, bulk oil storage, and large-capacity transformer applications where disposable units are uneconomical.
- NPT connections from 1" to 4" accommodate large-bore reservoir ports on bulk storage and industrial process vessels
- Easy-replace polypropylene desiccant bag with handles simplifies scheduled maintenance without tools
- Stainless steel variants available for corrosive, marine, and chemical processing environments
Transformer and Conservator Breathers
Silica gel breathers for oil-filled transformers protect insulating oil from moisture ingress that reduces dielectric strength and accelerates oxidation and sludge formation.
- Pressure equalisation system balances internal and external pressure, reducing stress on transformer seals
- Compatible with ONAN, ONAF, and OFAF transformer conservator tanks across distribution and power transformer ratings
- Integrated particulate filter protects silica gel bed, maximising adsorption capacity between service intervals
Standout Features & Benefits
Proven Contamination Reduction
- Replacing standard breather caps with desiccant units has extended oil service intervals from six months to eighteen months in documented hydraulic system applications
- Particulate filtration to 2-3 microns removes contaminants that bypass standard OEM caps entirely, reducing bearing wear and filter loading downstream
- Silica gel adsorbs up to 40% of its own weight in water, maintaining low internal humidity even in high-humidity coastal and tropical environments
Visual Maintenance Indicators
- Sight glass colour-change indicators allow desiccant saturation to be confirmed at a glance without climbing to the unit or removing it from service
- Foam pad oil mist collection provides a secondary visual cue — visible oil saturation on the pad signals high reservoir vapour activity requiring investigation
- Removable activation stickers keep the breather sealed during storage and transport, ensuring fresh desiccant on installation
Flexible Sizing and Connectivity
- Units available from small 15-gallon reservoir capacity up to rebuildable models covering tank farms exceeding 75,000 gallons
- Adapter kits with quick-connect fittings allow installation on vent valve ports, fill caps, and non-standard reservoir connections without thread modification
- Desiccant breathers for gearboxes mount directly onto existing breather ports with multi-fit NPT, NPSM, BSPT, and BSPP adapters
Long Service Life and Low Waste
- Rebuildable steel housings eliminate full-unit disposal — only the desiccant bag and filter elements require periodic replacement
- Desiccant breathers for oil tanks with check valve technology reduce unnecessary breathing cycles, extending replacement intervals in stable, low-traffic storage environments
- Activated carbon and molecular sieve options available for fuel and chemical applications where standard silica gel reacts with the stored medium
Application Areas
Oil, Gas & Petrochemical
- Bulk lubricant and hydraulic oil storage tanks at terminals, refineries, and process plants where frequent temperature cycling drives high air-exchange rates
- Drum and intermediate bulk container (IBC) venting to prevent contamination during storage and dispensing operations
- Produced water and chemical dosing vessel protection in upstream and midstream process environments
Power Generation & Transformers
- Conservator tank breathers on oil-filled distribution and power transformers protecting dielectric oil from moisture and particulate ingress
- Turbine lube oil reservoir and bearing housing protection in gas, steam, and hydro-power generation facilities
- UPS and switchgear transformer installations in data centres and critical infrastructure requiring long-term oil integrity
Manufacturing & Industrial Machinery
- Hydraulic power unit reservoirs on presses, injection moulding machines, and CNC machining centres where clean oil directly impacts seal and valve service life
- Gearbox breather replacement on conveyor drives, mixer gearboxes, and industrial reducers exposed to steam, dust, and temperature swings
- Centralised lubrication system reservoirs and grease storage drums in steel mills, paper plants, and cement facilities
Marine, Wind & Mobile Equipment
- Wind turbine gearbox and hydraulic nacelle system breathers rated for extreme temperature cycling and high-vibration environments
- Marine vessel hydraulic steering, deck machinery, and engine room lube oil systems with salt-air resistant stainless steel housing options
- Mobile construction and mining equipment hydraulic reservoirs requiring vibration-resistant extreme-duty breather configurations
