Zeagle Standard Signal Tube The Standard Signal Tube is a surface signaling device with its fluorescent orange and neon yellow coloring. The tube is inflated at the surface with an oral inflation valve and measures 6” x 60” for maximum visibility in choppy waters. For maximum visibility, the front of the tube is fluorescent orange, and the back of the tube is neon yellow. A hook & loop strap is used to secure the tube in a tight roll for storage in a BCD pocket when not in use. A handle at the bottom of the tube is available to tie a surface reel line to. A clear pocket is positioned at the top of the tube to hold a chemical or battery powered locating light (not included). These signal tubes offer maximum visibility for locating a diver.