Arlington’s non-conductive larger flange box extenders, extend set back electrical boxes up to 1-1/2 inches. The oversize flanges give extra device support when the wall opening is miscut or oversized. They hold larger cover plates, but are ‘trimmable’ for use with standard plates. Best of all they cost the same as Arlington’s ‘regular’ flange box extenders.
Single gang BE1X, two-gang BE2X, three-gang BE3X and BE4X. 2-hour fire rating.
Links: Spec sheet http://www.aifittings.com/landing/box-extenders/; Video http://www.aifittings.com/products/videos?category=&video=55.
For more information, please visit: www.aifittings.com.