C & I Enclosures Type 12 Standard Pushbutton Enclosures are UL Listed for indoor use to provide a degree of protection against dust, dirt, fiber flyings, dripping water, and external condensation of noncorrosive liquids. Fabricated in accordance with UL specifications from code gauge steel. An oil resistant gasket is attached to the cover to prevent dust intrusion. All seams are continuously welded and ground smooth.