Air Sentry D-Series breathers is constructed of industrial grade raw materials, tested to ensure a wide range of chemical compatibilities, and features high impact resistant ABS top and bottom caps. The clear acrylic tube makes it easy to inspect the condition of the color-changing silica gel from a distance. The silica gel turns from gold to dark green to visually indicate the adsorption of moisture and confirm the breather is getting the job done!Air Sentry D-Series breathers feature 2-micron solid particle filtration (one on the inlet and a second on the outlet) and are available with airflow ratings of 20 cfm.Applications: • Oil & lubricant storage tanks • Fluid Reservoirs • Transformers • Pumps • GearboxesSpecifications:- Base Material: 100% Silica Gel- Max. air flow/fluid flow: 20 cfm / 150 gpm- Mounting connections: Slip fit, 1”MNPT, 2” MNPT, 3”MNPT - Operating Temperature: -29°C to +93°C