This behemoth of a mask is top of the line in terms of air quality protection.
The purpose of the screw is to tighten the seal between the retention body and the mask body. It can be sanitized and reused. Although not approved by the FDA or NIOSH, the mask has been rigorously tested. The level of protection is customizable, depending on which material you use for the filter.
As with all our products, the mask can be washed and sanitized for full reusability.
The mask comes with one filter, plus a replacement. The inside has weather-seal gasket lining for extra protection and to fit comfortably on the face.
Pictured in White