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Air Sentry

Air Sentry has been the trusted name in contamination control for over four decades, protecting critical equipment across industries worldwide. As pioneers in desiccant breather technology, Air Sentry designs and manufactures high-performance breathers that safeguard lubricants, hydraulic fluids, and other vital fluids from moisture and particulate contamination.

From compact breathers for small gearboxes to high-capacity models for large reservoirs and bulk storage tanks, Air Sentry offers solutions engineered for reliability and long service life. Their color-changing silica gel technology provides clear visual indication of remaining capacity, making maintenance planning simple and effective.

Backed by rigorous testing and proven performance in the most demanding environments – from mining and steel production to power generation and manufacturing – Air Sentry breathers deliver measurable ROI through extended fluid life, reduced maintenance, and improved equipment reliability.

Browse our complete selection of Air Sentry desiccant breathers below to find the right protection for your equipment.
Which Air Sentry breather series fits your equipment?
Air Sentry organizes its desiccant breathers by reservoir size and duty: compact D and L series for small gearboxes, X and XR series for hydraulic reservoirs and gearboxes with higher airflow, and Z series for washdown and high-humidity service. PE Energy stocks 129 Air Sentry line items, of which 74 are desiccant breathers spanning the X, XR, L, D, M, R and Z series, so the common thread sizes and airflow ratings can ship from one order. A typical starting point is the X-50, the standard 1 inch NPT reservoir breather.
Do you stock replacement cartridges for breathers already in service?
Yes. Rebuildable Air Sentry housings take GRC series silica gel cartridges, and swapping the cartridge instead of the whole unit is the cheaper maintenance path once the gel changes color. The catalog carries 20 replacement cartridge line items, for example the GRC8S silica gel cartridge, plus PVAK pressure vacuum adapter kits such as the PVAK-1T for sealed reservoirs that must hold a slight pressure differential.

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