The Thomas & Betts B1EXT‑CRD is a UL-listed PVC box extender designed to correct installation setbacks often caused by renovations—like adding tile, paneling, or wainscoting. It adds up to 1⅛″ of depth to existing nonmetallic one-gang switch or outlet boxes (measuring approximately 2¼″ × 3¼″), aligning the device with the wall without disconnecting wiring. Featuring two mounting ears and compatibility with standard devices—including oversized dimmers and GFCIs—this durable blue extender simplifies remodeling tasks while preserving safety and compliance.