Box Extender - Double Gang Use a box extender when you want to bring the electrical device flush to the wall surface. The double gang extender will work for a one or two devices. Ask for our Installation Tips for more information on how to install and use. Price: 1-2 $6.00 Each 3 -5 $5.50 Each 6 -9 $5.25 Each 10 + $5.00 Each Product Id: X2 Unit of Measure: Each Quantity: