The Simplex 49WPBB-AVVOWR is a red weatherproof surface-mount back box designed for use with TrueAlert ES wall-mount weatherproof visible (V/O) and audible/visible (A/V) notification appliances. This enclosure is required for proper installation of compatible outdoor-rated TrueAlert ES addressable horn strobes and strobes.

Constructed for rugged applications, the back box provides a sealed mounting solution and supports NEMA 3R weatherproof installations. It is designed to match the footprint and mounting configuration of Simplex 49VO and 49AV Series weatherproof appliances.

The 49WPBB-AVVOWR ensures correct depth and alignment for outdoor mounting and supports compliance with UL 1638 outdoor-rated installations when used with listed appliances.