Air Sentry Z-135 breathers are designed for applications where space is limited or air flow requirements are below 5 cfm. The Z-Series is typically used on gearboxes and low fluid volume applications where mounting space is limited or where a larger breather won't fit without remote mounting.
The silica gel changes color as it becomes depleted, turning from gold to dark green. It's easy to identify the condition of a breather and quickly replace it, maintaining the cleanliness of the fluid reservoir.