Description Deluxe 6-Foot Cordura Signal Tube Comes with oral inflator, regulator inflator opening, dump valve, safety whistle and vinyl light stick holder! This unique cordura signal tube also comes with an opening in the bottom of the tube and is weighted by lead. This allows diver to inflate tube by free flowing air from the regulator. Unique internal membrane keeps air inside until released by activating dump valve. In addition, this signal tube can be inflated with screw down oral inflator.