OMS 1.57M-5'2" Diver's Alert Marker with Valve Closed End S.M.B. A24218001 OMS Closed End Divers Alert Marker Surface Marker Buoy, for indicating a Divers position in the Water on the Surface to a Dive Boat etc. Inflated using a Regulator or Octopus 2nd Stage or Air Inflation Gun or Nozzle through the Duck Valve which only allows air flow in one direction using a Standard DIN QD Fitting Suit/B.C.D. Inflation Hose or by Oral Mouth inflation. 1.57 Metres � 5�2� in Length & 16cm � 6 �� Wide, manufactured from Lightweight Flexible High Density Nylon with internal Polyurethane Coating providing a Buoyancy Lift of approximately 23 Kgs � 50 Lbs. 25mm � 1 Inch wide Webbing Attachment Strap with 316 Marine Grade Stainless Steel D-Ring. Pressure Relief Exhaust Valve with Pull Cord protects against overpressure & allows air to be easily released. Rolls up neatly when not in use & secures with the Elasticated Bungee Cord Strap & can be stored in a suitable Pocket or Pouch on a B.C.D. or Tech Harness or attached to Cylinders etc. with Bungee Cord etc. Bright Highly Visible Orange Colour Weighs only 0.28 Kgs. Also available in 1 Metre & 4.8 Metre Lengths.