The ENT Combination 2-Gang box/four square is designed for use with electrical non-metallic tubing (ENT). The 38 cu. in. box, the largest capacity available in the market today, houses the components for a switch or outlet. Box includes 1/2 in., 3/4 in. and 1 in. eccentric knock-outs; one box can be used with multiple sizes of ENT. Fire rated and UL listed for safety.