The Zeagle Deluxe Signal Tube is 7" wide and 60" long. For maximum visibility, the front of the tube is fluorescent orange, and the back of the tube is neon yellow. A unique feature of this Signal Tube is that the diver can fill the tube at depth by holding the open bottom of the tube over a regulator mouthpiece while the regulator is being purged. The air will enter the tube through a large Duck-bill valve at bottom. When the tube is sufficiently filled with air, the diver can release it to the surface (while tied to a line) A built-in Over Pressure Relief Valve allows the tube to ascend without rupturing. This way a diver can signal he will soon be ready for pick-up, without going to the surface immediately. There is also an oral inflate valve for surface use. A Velcro strap is used to secure the tube in a tight roll for storage in a BCD pocket when not in use. There is a handle at the bottom of the tube to tie a surface reel line. A clear pocket is positioned at the top of the tube to hold a chemical or battery powered locating light (not included). This signal tube offers maximum visibility for locating a diver. The Deluxe Signal Tube develops 22 lbs. of lift in fresh water. Zeagle Signal Tubes roll up and fasten with Velcro straps in a tight roll that will fit in a BCD pocket until needed.