Middle Atlantic 5751AWH STL Extension Box Adapter White

Overview

The Middle Atlantic 5751AWH is a white steel extension box adapter fitting designed for flush-mount raceway installations where a standard single-gang box depth falls short. When an outlet or low-voltage device requires additional backbox depth that a flat surface plate cannot provide, the 5751AWH adds the necessary projection — 1.88 in (4.8 cm) deep — without opening the wall. At 4.75 in wide by 3 in tall, it matches standard device mounting footprints and keeps the installation clean and code-compliant. The white finish coordinates with white raceway runs. TAA-compliant, making it eligible for government and federally funded projects.

Compatibility

Designed for use with Middle Atlantic 500-series and 700-series deep flush-type raceway fittings. Fits standard single-gang device openings within those raceway lines. Intended for use with low-voltage devices, outlet inserts, and keystone plates that mount into the 500/700-series system. Confirm raceway series and gang count before ordering — this adapter is single-gang and white; other finishes and sizes are separate SKUs in the cable management and raceway category.

Installation Notes

Mounts as an extension between the raceway body and the cover plate to add 1.88 in of box depth. Verify that the device or insert being installed does not exceed the combined depth created by the raceway channel plus this adapter. Color match is white — do not mix with ivory or light almond covers unless a color transition is intentional. TAA compliance applies to the 5751AWH SKU specifically; verify compliance documentation for adjacent components independently if the full assembly must satisfy TAA requirements.