Rectangular box that a piece of 1/2" through 4" PVC is put into so it can be heated to the point where it can be bent for offsets, saddles, bends, etc. As compared to the PVC BLANKET, the HOT BOX bends a longer section of pipe and covers a wider range of sizes in one product. The PVC BLANKET, however, is smaller and more portable. To make bends, the electrician puts the pipe into the box, powers on the unit, rotates the pipe while it heats-up and waits for the pipe to become flexible. The pipe is then removed from the box and bent into the appropriate shape.