Polyurethane encapsulated back boxes are available to provide extra protection from incursion of moisture and water by sealing seams, knock-outs, and holes. Using our standard double zinc plated back boxes (BBX) a 1/16" thick jacket of polyurethane is applied to the exterior sides and bottom of the back boxes, permanently bonding with surfaces to form a moisture resistant seal. The polyurethane back box provides protection against harsh climate, chemicals, impact and abrasion. All polyurethane back boxes will have a model number suffix of "W".
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