Bi-directional Air Flow: As moist air flows through the breather`s filtration system, it is cleaned of impurities and dried. Expelled air partially regenerates the silica gel and "back flushes" the particulate to prolong the life of the breather. Durable Construction: The desiccant air breathers are manufactured from rugged ABS plastic and impact-modified Plexiglas. Water Vapor Absorbent: Silica gel is chemically inert, non-toxic, non-deliquescent, non-corrosive and environmentally disposable. Its internal structure of interconnected microscopic pores absorbs up to 40% of its weight. Color Indicator: As the gold silica gel absorbs water, it turns green to indicate that it has reached its functional capacity and that replacement of the breather is required. Dual Anti-static Filter System: The solid contaminant filters are designed to reduce the potential for explosion in dusty environments. Safety Sealed: To ensure a long shelf life and premium operating performance, each desiccant breather is individually sealed and vacuum packed to protect it from moisture before it is placed in service.