A perforator vein is a small vein that connects the deep and superficial systems together. They are usually short in length and have only a few valves in them. They can have reflux just like other veins in the legs. These small connector veins run horizontally across the leg and not vertically up and down the leg. It is like the horizontal cross on the letter H. These perforators can be the source to visible varicose veins in the calf or thigh.