This unique signal tube 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 surface marker tube can be inflated with screw down oral inflator. Also known as SMB, Safety Sausage, Signal Tube or Surface Marker.
Great safety sausage. Rolls up nice fits in pocket or clip onto BC. Very bright and visible. Never dive with out a safety sausage!!!